diff --git a/packages/core/__tests__/lib/core-check.test.ts b/packages/core/__tests__/lib/core-check.test.ts
new file mode 100644
index 0000000..ba97f3f
--- /dev/null
+++ b/packages/core/__tests__/lib/core-check.test.ts
@@ -0,0 +1,32 @@
+import Core from './../../src';
+
+describe("@idraw/core static check", () => {
+
+  test('Core.check.attrs', () => {
+    expect(Core.check.attrs({
+      x: 0,
+      y: 100,
+      w: 200,
+      h: 200,
+      angle: 0
+    })).toStrictEqual(true);
+
+    expect(Core.check.attrs({
+      x: 0,
+      y: 100,
+      w: -200,
+      h: 200,
+      angle: 0
+    })).toStrictEqual(false);
+
+
+    expect(Core.check.attrs({
+      x: 0,
+      y: 100,
+      w: 200,
+      h: 200,
+      angle: -99999
+    })).toStrictEqual(false);
+  });
+
+})
\ No newline at end of file
diff --git a/packages/core/__tests__/lib/core-is.test.ts b/packages/core/__tests__/lib/core-is.test.ts
new file mode 100644
index 0000000..66f8492
--- /dev/null
+++ b/packages/core/__tests__/lib/core-is.test.ts
@@ -0,0 +1,47 @@
+import Core from './../../src';
+
+describe("@idraw/core static is", () => {
+
+  test('Core.is.number', () => {
+    expect(Core.is.number(0)).toStrictEqual(true);
+    expect(Core.is.number(100)).toStrictEqual(true);
+    expect(Core.is.number(-100)).toStrictEqual(true);
+    expect(Core.is.number('abc')).toStrictEqual(false);
+  });
+
+  test('Core.is.x', () => {
+    expect(Core.is.x(0)).toStrictEqual(true);
+    expect(Core.is.x(100)).toStrictEqual(true);
+    expect(Core.is.x(-100)).toStrictEqual(true);
+    expect(Core.is.x('abc')).toStrictEqual(false);
+  });
+
+  test('Core.is.y', () => {
+    expect(Core.is.y(0)).toStrictEqual(true);
+    expect(Core.is.y(100)).toStrictEqual(true);
+    expect(Core.is.y(-100)).toStrictEqual(true);
+    expect(Core.is.y('abc')).toStrictEqual(false);
+  });
+
+  test('Core.is.w', () => {
+    expect(Core.is.w(0)).toStrictEqual(true);
+    expect(Core.is.w(100)).toStrictEqual(true);
+    expect(Core.is.w(-100)).toStrictEqual(false);
+    expect(Core.is.w('abc')).toStrictEqual(false);
+  });
+
+  test('Core.is.h', () => {
+    expect(Core.is.h(0)).toStrictEqual(true);
+    expect(Core.is.h(100)).toStrictEqual(true);
+    expect(Core.is.h(-100)).toStrictEqual(false);
+    expect(Core.is.h('abc')).toStrictEqual(false);
+  });
+
+  test('Core.is.angle', () => {
+    expect(Core.is.angle(0)).toStrictEqual(true);
+    expect(Core.is.angle(100)).toStrictEqual(true);
+    expect(Core.is.angle(-100)).toStrictEqual(true);
+    expect(Core.is.angle(-370)).toStrictEqual(false);
+  });
+
+})
\ No newline at end of file
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 3829614..2b6c356 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -13,6 +13,8 @@ import { Helper } from './lib/helper';
 import { mergeConfig } from './lib/config';
 import { CoreEvent, TypeCoreEventArgMap } from './lib/core-event';
 import { parseData } from './lib/parse';
+import is from './lib/is';
+import check from './lib/check';
 
 const { time } = util;
 const { deepClone } = util.data;
@@ -58,6 +60,9 @@ class Core {
   private [_prevPoint]: TypePoint | null = null;
   private [_selectedDotDirection]: TypeHelperWrapperDotDirection | null = null;
 
+  static is = is;
+  static check = check;
+
   constructor(mount: HTMLDivElement, opts: TypeCoreOptions, config?: TypeConfig) {
     this[_data] = { elements: [] };
     this[_opts] = opts;
diff --git a/packages/core/src/lib/check.ts b/packages/core/src/lib/check.ts
new file mode 100644
index 0000000..acdd5e4
--- /dev/null
+++ b/packages/core/src/lib/check.ts
@@ -0,0 +1,45 @@
+
+import { TypeElementAttrs} from '@idraw/types';
+import util from '@idraw/util';
+import is from './is';
+
+const { isColorStr } = util.color;
+
+function attrs(
+  attrs: TypeElementAttrs
+): boolean {
+  const { x, y, w, h, angle } = attrs;
+  if (!(is.x(x) && is.y(y) && is.w(w) && is.h(h) && is.angle(angle))) {
+    return false;
+  }
+  if (!(angle >= -360 && angle <= 360 )) {
+    return false;
+  }
+  return true;
+}
+
+function rectDesc(
+  desc: any
+): boolean {
+  const { borderColor, borderRadius, borderWidth, color } = desc;
+  if (typeof borderColor === 'string' && !isColorStr(color)) {
+    return false;
+  }
+  if (typeof borderColor === 'string' && !isColorStr(borderColor)) {
+    return false;
+  }
+  if (typeof borderRadius === 'number' && !is.number(borderRadius)) {
+    return false;
+  }
+  if (typeof borderWidth === 'number' && !is.number(borderWidth)) {
+    return false;
+  }
+  return true;
+}
+
+const check = {
+  attrs,
+  rectDesc,
+}
+
+export default check;
\ No newline at end of file
diff --git a/packages/core/src/lib/is.ts b/packages/core/src/lib/is.ts
new file mode 100644
index 0000000..7ed2702
--- /dev/null
+++ b/packages/core/src/lib/is.ts
@@ -0,0 +1,30 @@
+
+function number(value: any) {
+  return (typeof value === 'number' && (value > 0 || value <= 0))
+}
+
+function x(value: any) {
+  return number(value);
+}
+
+function y(value: any) {
+  return number(value);
+}
+
+function w(value: any) {
+  return (typeof value === 'number' && value >= 0)
+}
+
+function h(value: any) {
+  return (typeof value === 'number' && value >= 0)
+}
+
+function angle(value: any) {
+  return (typeof value === 'number' && value >= -360 && value <= 360)
+}
+
+const is = {
+  x, y, w, h, angle, number,
+}
+
+export default is;
\ No newline at end of file
diff --git a/packages/core/src/lib/value.ts b/packages/core/src/lib/value.ts
index 06b7297..c224a9b 100644
--- a/packages/core/src/lib/value.ts
+++ b/packages/core/src/lib/value.ts
@@ -6,4 +6,4 @@ export function limitNum(num: number): number {
 
 export function limitAngle(angle: number): number {
   return limitNum(angle % 360);
-}
\ No newline at end of file
+}
diff --git a/packages/types/src/lib/element.ts b/packages/types/src/lib/element.ts
index 1b6c3e2..a9016ec 100644
--- a/packages/types/src/lib/element.ts
+++ b/packages/types/src/lib/element.ts
@@ -1,14 +1,17 @@
 // import { TypePaintData } from './paint';
 
-type TypeElement<T extends keyof TypeElemDesc> = {
-  name?: string;
-  uuid: string;
-  type: T;
+type TypeElementAttrs = {
   x: number;
   y: number;
   w: number;
   h: number;
-  angle?: number;
+  angle: number;
+}
+
+type TypeElement<T extends keyof TypeElemDesc> = TypeElementAttrs & {
+  name?: string;
+  uuid: string;
+  type: T;
   desc: TypeElemDesc[T];
 }
 
@@ -28,7 +31,7 @@ type TypeElemDesc = {
 }
 
 type TypeElemDescRect = {
-  color: string;
+  color?: string;
 } & TypeElemBoxDesc
 
 type TypeElemDescText = {
@@ -58,6 +61,7 @@ type TypeElemDescSVG = {
 // type TypeElemDescPaint = TypePaintData
 
 export {
+  TypeElementAttrs,
   TypeElemDescText,
   TypeElemDescRect,
   TypeElemDescCircle,