diff --git a/rust-lib/flowy-ot/src/client/document.rs b/rust-lib/flowy-ot/src/client/document.rs
index cfeab02b05..2d5507214d 100644
--- a/rust-lib/flowy-ot/src/client/document.rs
+++ b/rust-lib/flowy-ot/src/client/document.rs
@@ -34,7 +34,7 @@ impl Document {
         }
         let probe = Interval::new(index, index + 1);
         let mut attributes = self.data.get_attributes(probe);
-        if attributes == Attributes::Empty {
+        if attributes.is_empty() {
             attributes = Attributes::Follow;
         }
         let mut delta = Delta::new();
@@ -55,7 +55,7 @@ impl Document {
             true => AttrsBuilder::new().add(attribute).build(),
             false => AttrsBuilder::new().remove(&attribute).build(),
         };
-
+        log::debug!("format with {} at {}", attributes, interval);
         self.update_with_attribute(attributes, interval)
     }
 
@@ -153,22 +153,19 @@ impl Document {
         mut attributes: Attributes,
         interval: Interval,
     ) -> Result<(), OTError> {
+        log::debug!("Update document with attributes: {:?}", attributes,);
         let old_attributes = self.data.get_attributes(interval);
-        log::debug!(
-            "combine attributes: {:?} : {:?}",
-            attributes,
-            old_attributes
-        );
+        log::debug!("combine with old: {:?}", old_attributes);
         let new_attributes = match &mut attributes {
             Attributes::Follow => old_attributes,
             Attributes::Custom(attr_data) => {
                 attr_data.extend(old_attributes.data(), true);
+                log::debug!("combine with old result : {:?}", attr_data);
                 attr_data.clone().into_attributes()
             },
-            Attributes::Empty => Attributes::Empty,
         };
 
-        log::debug!("combined result: {:?}", new_attributes);
+        log::debug!("combine result: {:?}", new_attributes);
         let retain = Builder::retain(interval.size())
             .attributes(new_attributes)
             .build();
@@ -202,6 +199,7 @@ impl Document {
             self.history.record(undo_delta);
         }
 
+        log::debug!("document delta: {}", &composed_delta);
         Ok(composed_delta)
     }
 
diff --git a/rust-lib/flowy-ot/src/core/attributes/attributes.rs b/rust-lib/flowy-ot/src/core/attributes/attributes.rs
index 10c249ee0b..7b1f11af1b 100644
--- a/rust-lib/flowy-ot/src/core/attributes/attributes.rs
+++ b/rust-lib/flowy-ot/src/core/attributes/attributes.rs
@@ -7,16 +7,13 @@ pub enum Attributes {
     #[serde(skip)]
     Follow,
     Custom(AttributesData),
-    #[serde(skip)]
-    Empty,
 }
 
 impl fmt::Display for Attributes {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         match self {
             Attributes::Follow => f.write_str("follow"),
-            Attributes::Custom(data) => f.write_fmt(format_args!("{:?}", data.inner)),
-            Attributes::Empty => f.write_str("empty"),
+            Attributes::Custom(data) => f.write_fmt(format_args!("{}", data)),
         }
     }
 }
@@ -26,13 +23,19 @@ impl Attributes {
         match self {
             Attributes::Follow => None,
             Attributes::Custom(data) => Some(data.clone()),
-            Attributes::Empty => None,
+        }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        match self {
+            Attributes::Follow => false,
+            Attributes::Custom(data) => data.is_empty(),
         }
     }
 }
 
 impl std::default::Default for Attributes {
-    fn default() -> Self { Attributes::Empty }
+    fn default() -> Self { Attributes::Custom(AttributesData::new()) }
 }
 
 pub(crate) fn attributes_from(operation: &Option<Operation>) -> Option<Attributes> {
@@ -44,7 +47,7 @@ pub(crate) fn attributes_from(operation: &Option<Operation>) -> Option<Attribute
 
 pub fn compose_operation(left: &Option<Operation>, right: &Option<Operation>) -> Attributes {
     if left.is_none() && right.is_none() {
-        return Attributes::Empty;
+        return Attributes::default();
     }
     let attr_l = attributes_from(left);
     let attr_r = attributes_from(right);
@@ -66,13 +69,12 @@ pub fn transform_operation(left: &Option<Operation>, right: &Option<Operation>)
 
     if attr_l.is_none() {
         if attr_r.is_none() {
-            return Attributes::Empty;
+            return Attributes::default();
         }
 
         return match attr_r.as_ref().unwrap() {
             Attributes::Follow => Attributes::Follow,
             Attributes::Custom(_) => attr_r.unwrap(),
-            Attributes::Empty => Attributes::Empty,
         };
     }
 
@@ -84,7 +86,7 @@ pub fn invert_attributes(attr: Attributes, base: Attributes) -> Attributes {
     let base = base.data();
 
     if attr.is_none() && base.is_none() {
-        return Attributes::Empty;
+        return Attributes::default();
     }
 
     let attr = attr.unwrap_or(AttributesData::new());
@@ -125,7 +127,6 @@ fn compose_attributes(left: Attributes, right: Attributes) -> Attributes {
     log::trace!("compose_attributes: a: {:?}, b: {:?}", left, right);
 
     let attr = match (&left, &right) {
-        (_, Attributes::Empty) => Attributes::Empty,
         (_, Attributes::Custom(_)) => merge_attributes(left, right),
         (Attributes::Custom(_), _) => merge_attributes(left, right),
         _ => Attributes::Follow,
@@ -149,6 +150,6 @@ fn transform_attributes(left: Attributes, right: Attributes) -> Attributes {
 
             Attributes::Custom(result)
         },
-        _ => Attributes::Empty,
+        _ => Attributes::default(),
     }
 }
diff --git a/rust-lib/flowy-ot/src/core/attributes/data.rs b/rust-lib/flowy-ot/src/core/attributes/data.rs
index 31fdba17b1..adc35dd416 100644
--- a/rust-lib/flowy-ot/src/core/attributes/data.rs
+++ b/rust-lib/flowy-ot/src/core/attributes/data.rs
@@ -11,6 +11,12 @@ pub struct AttributesData {
     pub(crate) inner: HashMap<Attribute, String>,
 }
 
+impl fmt::Display for AttributesData {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_fmt(format_args!("{:?}", self.inner))
+    }
+}
+
 impl AttributesData {
     pub fn new() -> Self {
         AttributesData {
@@ -34,11 +40,12 @@ impl AttributesData {
         if prune {
             let mut new_attributes = other.unwrap().inner;
             self.inner.iter().for_each(|(k, v)| {
-                if should_remove(v) {
-                    new_attributes.remove(k);
-                } else {
-                    new_attributes.insert(k.clone(), v.clone());
-                }
+                // if should_remove(v) {
+                //     new_attributes.remove(k);
+                // } else {
+                //     new_attributes.insert(k.clone(), v.clone());
+                // }
+                new_attributes.insert(k.clone(), v.clone());
             });
             self.inner = new_attributes;
         } else {
@@ -56,10 +63,8 @@ impl AttributesDataRule for AttributesData {
     fn apply_rule(&mut self) { self.inner.retain(|_, v| !should_remove(v)); }
 
     fn into_attributes(mut self) -> Attributes {
-        self.apply_rule();
-
         if self.is_plain() {
-            Attributes::Empty
+            Attributes::default()
         } else {
             Attributes::Custom(self)
         }
@@ -74,8 +79,10 @@ impl AttributesRule for Attributes {
     fn apply_rule(self) -> Attributes {
         match self {
             Attributes::Follow => self,
-            Attributes::Custom(data) => data.into_attributes(),
-            Attributes::Empty => self,
+            Attributes::Custom(mut data) => {
+                data.apply_rule();
+                data.into_attributes()
+            },
         }
     }
 }
diff --git a/rust-lib/flowy-ot/src/core/delta.rs b/rust-lib/flowy-ot/src/core/delta.rs
index d0af7281a8..ceea70a79f 100644
--- a/rust-lib/flowy-ot/src/core/delta.rs
+++ b/rust-lib/flowy-ot/src/core/delta.rs
@@ -261,15 +261,7 @@ impl Delta {
                                 &chars.take(o_retain.n as usize).collect::<String>(),
                                 composed_attrs,
                             );
-                            next_op1 = Some(
-                                Builder::insert(&chars.collect::<String>())
-                                    // consider this situation: 
-                                    // [insert:12345678 - retain:4], 
-                                    //      the attributes of "5678" should be empty and the following 
-                                    //      retain will bringing the attributes. 
-                                    .attributes(Attributes::Empty)
-                                    .build(),
-                            );
+                            next_op1 = Some(Builder::insert(&chars.collect::<String>()).build());
                             next_op2 = ops2.next();
                         },
                     }
@@ -594,7 +586,7 @@ impl Delta {
     pub fn get_attributes(&self, interval: Interval) -> Attributes {
         let mut attributes_data = AttributesData::new();
         let mut offset: usize = 0;
-
+        log::debug!("Get attributes at {:?}", interval);
         self.ops.iter().for_each(|op| match op {
             Operation::Delete(_n) => {},
             Operation::Retain(_retain) => {
@@ -615,17 +607,19 @@ impl Delta {
                     Attributes::Follow => {},
                     Attributes::Custom(data) => {
                         if interval.contains_range(offset, offset + end) {
-                            log::debug!("Get attributes from op: {:?} at {:?}", op, interval);
+                            log::debug!("extend attributes with {} ", &data);
                             attributes_data.extend(Some(data.clone()), false);
                         }
                     },
-                    Attributes::Empty => {},
                 }
                 offset += end
             },
         });
 
-        attributes_data.into_attributes()
+        attributes_data.apply_rule();
+        let attribute = attributes_data.into_attributes();
+        log::debug!("Get attributes result: {} ", &attribute);
+        attribute
     }
 
     pub fn to_json(&self) -> String { serde_json::to_string(self).unwrap_or("".to_owned()) }
diff --git a/rust-lib/flowy-ot/src/core/operation/builder.rs b/rust-lib/flowy-ot/src/core/operation/builder.rs
index 993cf213fc..b717fd7f3e 100644
--- a/rust-lib/flowy-ot/src/core/operation/builder.rs
+++ b/rust-lib/flowy-ot/src/core/operation/builder.rs
@@ -9,7 +9,7 @@ impl Builder {
     pub fn new(ty: Operation) -> Builder {
         Builder {
             ty,
-            attrs: Attributes::Empty,
+            attrs: Attributes::default(),
         }
     }
 
diff --git a/rust-lib/flowy-ot/src/core/operation/operation.rs b/rust-lib/flowy-ot/src/core/operation/operation.rs
index cb893dd01c..2ca586060c 100644
--- a/rust-lib/flowy-ot/src/core/operation/operation.rs
+++ b/rust-lib/flowy-ot/src/core/operation/operation.rs
@@ -32,7 +32,7 @@ impl Operation {
 
     pub fn get_attributes(&self) -> Attributes {
         match self {
-            Operation::Delete(_) => Attributes::Empty,
+            Operation::Delete(_) => Attributes::default(),
             Operation::Retain(retain) => retain.attributes.clone(),
             Operation::Insert(insert) => insert.attributes.clone(),
         }
@@ -55,9 +55,7 @@ impl Operation {
     pub fn has_attribute(&self) -> bool {
         match self.get_attributes() {
             Attributes::Follow => false,
-            // Attributes::Custom(data) => !data.is_plain(),
-            Attributes::Custom(data) => true,
-            Attributes::Empty => false,
+            Attributes::Custom(data) => !data.is_plain(),
         }
     }
 
@@ -147,7 +145,7 @@ impl Retain {
                 self.n += n;
                 None
             },
-            Attributes::Custom(_) | Attributes::Empty => {
+            Attributes::Custom(_) => {
                 if self.attributes == attributes {
                     self.n += n;
                     None
@@ -162,7 +160,6 @@ impl Retain {
         match &self.attributes {
             Attributes::Follow => true,
             Attributes::Custom(data) => data.is_plain(),
-            Attributes::Empty => true,
         }
     }
 }
@@ -225,7 +222,7 @@ impl Insert {
                 self.s += s;
                 return None;
             },
-            Attributes::Custom(_) | Attributes::Empty => {
+            Attributes::Custom(_) => {
                 if self.attributes == attributes {
                     self.s += s;
                     None
@@ -254,6 +251,5 @@ fn is_empty(attributes: &Attributes) -> bool {
     match attributes {
         Attributes::Follow => true,
         Attributes::Custom(data) => data.is_plain(),
-        Attributes::Empty => true,
     }
 }
diff --git a/rust-lib/flowy-ot/src/core/operation/operation_serde.rs b/rust-lib/flowy-ot/src/core/operation/operation_serde.rs
index f84e8bcabe..62ab3eed7b 100644
--- a/rust-lib/flowy-ot/src/core/operation/operation_serde.rs
+++ b/rust-lib/flowy-ot/src/core/operation/operation_serde.rs
@@ -82,7 +82,7 @@ impl<'de> Deserialize<'de> for Operation {
                 match operation {
                     None => Err(de::Error::missing_field("operation")),
                     Some(mut operation) => {
-                        operation.set_attributes(attributes.unwrap_or(Attributes::Empty));
+                        operation.set_attributes(attributes.unwrap_or(Attributes::default()));
                         Ok(operation)
                     },
                 }
diff --git a/rust-lib/flowy-ot/tests/helper/mod.rs b/rust-lib/flowy-ot/tests/helper/mod.rs
index aa1c2df008..06794f251a 100644
--- a/rust-lib/flowy-ot/tests/helper/mod.rs
+++ b/rust-lib/flowy-ot/tests/helper/mod.rs
@@ -57,7 +57,7 @@ impl OpTester {
         static INIT: Once = Once::new();
         INIT.call_once(|| {
             color_eyre::install().unwrap();
-            std::env::set_var("RUST_LOG", "debug");
+            std::env::set_var("RUST_LOG", "info");
             env_logger::init();
         });
 
@@ -201,18 +201,21 @@ impl Rng {
             };
             match self.0.gen_range(0.0, 1.0) {
                 f if f < 0.2 => {
-                    delta.insert(&self.gen_string(i), Attributes::Empty);
+                    delta.insert(&self.gen_string(i), Attributes::default());
                 },
                 f if f < 0.4 => {
                     delta.delete(i);
                 },
                 _ => {
-                    delta.retain(i, Attributes::Empty);
+                    delta.retain(i, Attributes::Follow);
                 },
             }
         }
         if self.0.gen_range(0.0, 1.0) < 0.3 {
-            delta.insert(&("1".to_owned() + &self.gen_string(10)), Attributes::Empty);
+            delta.insert(
+                &("1".to_owned() + &self.gen_string(10)),
+                Attributes::default(),
+            );
         }
         delta
     }
diff --git a/rust-lib/flowy-ot/tests/op_test.rs b/rust-lib/flowy-ot/tests/op_test.rs
index adbd18d4cd..6ab6d8faae 100644
--- a/rust-lib/flowy-ot/tests/op_test.rs
+++ b/rust-lib/flowy-ot/tests/op_test.rs
@@ -125,13 +125,13 @@ fn lengths() {
     let mut delta = Delta::default();
     assert_eq!(delta.base_len, 0);
     assert_eq!(delta.target_len, 0);
-    delta.retain(5, Attributes::Empty);
+    delta.retain(5, Attributes::default());
     assert_eq!(delta.base_len, 5);
     assert_eq!(delta.target_len, 5);
-    delta.insert("abc", Attributes::Empty);
+    delta.insert("abc", Attributes::default());
     assert_eq!(delta.base_len, 5);
     assert_eq!(delta.target_len, 8);
-    delta.retain(2, Attributes::Empty);
+    delta.retain(2, Attributes::default());
     assert_eq!(delta.base_len, 7);
     assert_eq!(delta.target_len, 10);
     delta.delete(2);
@@ -141,10 +141,10 @@ fn lengths() {
 #[test]
 fn sequence() {
     let mut delta = Delta::default();
-    delta.retain(5, Attributes::Empty);
-    delta.retain(0, Attributes::Empty);
-    delta.insert("appflowy", Attributes::Empty);
-    delta.insert("", Attributes::Empty);
+    delta.retain(5, Attributes::default());
+    delta.retain(0, Attributes::default());
+    delta.insert("appflowy", Attributes::default());
+    delta.insert("", Attributes::default());
     delta.delete(3);
     delta.delete(0);
     assert_eq!(delta.ops.len(), 3);
@@ -165,11 +165,11 @@ fn apply_1000() {
 fn apply() {
     let s = "hello world,".to_owned();
     let mut delta_a = Delta::default();
-    delta_a.insert(&s, Attributes::Empty);
+    delta_a.insert(&s, Attributes::default());
 
     let mut delta_b = Delta::default();
-    delta_b.retain(s.len(), Attributes::Empty);
-    delta_b.insert("appflowy", Attributes::Empty);
+    delta_b.retain(s.len(), Attributes::default());
+    delta_b.insert("appflowy", Attributes::default());
 
     let after_a = delta_a.apply("").unwrap();
     let after_b = delta_b.apply(&after_a).unwrap();
@@ -179,15 +179,15 @@ fn apply() {
 #[test]
 fn base_len_test() {
     let mut delta_a = Delta::default();
-    delta_a.insert("a", Attributes::Empty);
-    delta_a.insert("b", Attributes::Empty);
-    delta_a.insert("c", Attributes::Empty);
+    delta_a.insert("a", Attributes::default());
+    delta_a.insert("b", Attributes::default());
+    delta_a.insert("c", Attributes::default());
 
     let s = "hello world,".to_owned();
     delta_a.delete(s.len());
     let after_a = delta_a.apply(&s).unwrap();
 
-    delta_a.insert("d", Attributes::Empty);
+    delta_a.insert("d", Attributes::default());
     assert_eq!("abc", &after_a);
 }
 
@@ -207,8 +207,8 @@ fn invert() {
 #[test]
 fn empty_ops() {
     let mut delta = Delta::default();
-    delta.retain(0, Attributes::Empty);
-    delta.insert("", Attributes::Empty);
+    delta.retain(0, Attributes::default());
+    delta.insert("", Attributes::default());
     delta.delete(0);
     assert_eq!(delta.ops.len(), 0);
 }
@@ -216,33 +216,33 @@ fn empty_ops() {
 fn eq() {
     let mut delta_a = Delta::default();
     delta_a.delete(1);
-    delta_a.insert("lo", Attributes::Empty);
-    delta_a.retain(2, Attributes::Empty);
-    delta_a.retain(3, Attributes::Empty);
+    delta_a.insert("lo", Attributes::default());
+    delta_a.retain(2, Attributes::default());
+    delta_a.retain(3, Attributes::default());
     let mut delta_b = Delta::default();
     delta_b.delete(1);
-    delta_b.insert("l", Attributes::Empty);
-    delta_b.insert("o", Attributes::Empty);
-    delta_b.retain(5, Attributes::Empty);
+    delta_b.insert("l", Attributes::default());
+    delta_b.insert("o", Attributes::default());
+    delta_b.retain(5, Attributes::default());
     assert_eq!(delta_a, delta_b);
     delta_a.delete(1);
-    delta_b.retain(1, Attributes::Empty);
+    delta_b.retain(1, Attributes::default());
     assert_ne!(delta_a, delta_b);
 }
 #[test]
 fn ops_merging() {
     let mut delta = Delta::default();
     assert_eq!(delta.ops.len(), 0);
-    delta.retain(2, Attributes::Empty);
+    delta.retain(2, Attributes::default());
     assert_eq!(delta.ops.len(), 1);
     assert_eq!(delta.ops.last(), Some(&Builder::retain(2).build()));
-    delta.retain(3, Attributes::Empty);
+    delta.retain(3, Attributes::default());
     assert_eq!(delta.ops.len(), 1);
     assert_eq!(delta.ops.last(), Some(&Builder::retain(5).build()));
-    delta.insert("abc", Attributes::Empty);
+    delta.insert("abc", Attributes::default());
     assert_eq!(delta.ops.len(), 2);
     assert_eq!(delta.ops.last(), Some(&Builder::insert("abc").build()));
-    delta.insert("xyz", Attributes::Empty);
+    delta.insert("xyz", Attributes::default());
     assert_eq!(delta.ops.len(), 2);
     assert_eq!(delta.ops.last(), Some(&Builder::insert("abcxyz").build()));
     delta.delete(1);
@@ -256,11 +256,11 @@ fn ops_merging() {
 fn is_noop() {
     let mut delta = Delta::default();
     assert!(delta.is_noop());
-    delta.retain(5, Attributes::Empty);
+    delta.retain(5, Attributes::default());
     assert!(delta.is_noop());
-    delta.retain(3, Attributes::Empty);
+    delta.retain(3, Attributes::default());
     assert!(delta.is_noop());
-    delta.insert("lorem", Attributes::Empty);
+    delta.insert("lorem", Attributes::default());
     assert!(!delta.is_noop());
 }
 #[test]
@@ -322,7 +322,7 @@ fn delta_transform_test() {
 
     let mut b = Delta::default();
     let mut b_s = String::new();
-    b.insert("456", Attributes::Empty);
+    b.insert("456", Attributes::default());
     b_s = b.apply(&b_s).unwrap();
     assert_eq!(&b_s, "456");