diff --git a/ts/world/Event.ts b/ts/world/Event.ts
index a627e56..090ebc3 100644
--- a/ts/world/Event.ts
+++ b/ts/world/Event.ts
@@ -186,7 +186,7 @@ const EventModule = {
         var pIntersect = pickResult[0];
         var pCamera = camera.getPosition();
         var legnth2Intersect = MathUtils.getLengthFromVerticeToVertice(pCamera, pIntersect);
-        var mat = camera.matrix.copy();
+        var mat = camera.matrix.clone();
         mat.setColumnTrans(pIntersect.x, pIntersect.y, pIntersect.z);
         var DELTA_RADIAN = MathUtils.degreeToRadian(DELTA_PITCH);
         mat.localRotateX(DELTA_RADIAN);
diff --git a/ts/world/Line.ts b/ts/world/Line.ts
index 641f00c..5862957 100644
--- a/ts/world/Line.ts
+++ b/ts/world/Line.ts
@@ -7,23 +7,23 @@ class Line{
     public vector: Vector;
 
     constructor(position: Vertice, direction: Vector){
-        this.vertice = position.getCopy();
-        this.vector = direction.getCopy();
+        this.vertice = position.clone();
+        this.vector = direction.clone();
         this.vector.normalize();
     }
 
     setVertice(position: Vertice): Line {
-        this.vertice = position.getCopy();
+        this.vertice = position.clone();
         return this;
     }
     
     setVector(direction: Vector): Line {
-        this.vector = direction.getCopy();
+        this.vector = direction.clone();
         this.vector.normalize();
         return this;
     }
 
-    getCopy(): Line {
+    clone(): Line {
         var lineCopy = new Line(this.vertice, this.vector);
         return lineCopy;
     }
diff --git a/ts/world/Math.ts b/ts/world/Math.ts
index db90449..f15c81f 100644
--- a/ts/world/Math.ts
+++ b/ts/world/Math.ts
@@ -80,9 +80,9 @@ const MathUtils = {
      * 计算三角形的面积
      */
     getTriangleArea(v1: Vertice, v2: Vertice, v3: Vertice){
-        var v1Copy = v1.getCopy();
-        var v2Copy = v2.getCopy();
-        var v3Copy = v3.getCopy();
+        var v1Copy = v1.clone();
+        var v2Copy = v2.clone();
+        var v3Copy = v3.clone();
         var direction = Vector.verticeMinusVertice(v3Copy, v2Copy);
         var line = new Line(v2Copy,direction);
         var h = this.getLengthFromVerticeToLine(v1Copy,line);
@@ -98,8 +98,8 @@ const MathUtils = {
      * @return {Number}
      */
     getLengthFromVerticeToVertice(vertice1: Vertice, vertice2: Vertice){
-        var vertice1Copy = vertice1.getCopy();
-        var vertice2Copy = vertice2.getCopy();
+        var vertice1Copy = vertice1.clone();
+        var vertice2Copy = vertice2.clone();
         var length2 = Math.pow(vertice1Copy.x-vertice2Copy.x,2) + Math.pow(vertice1Copy.y-vertice2Copy.y,2) + Math.pow(vertice1Copy.z-vertice2Copy.z,2);
         var length = Math.sqrt(length2);
         return length;
@@ -113,8 +113,8 @@ const MathUtils = {
      * @return {Number}
      */
     getLengthFromVerticeToLine : function(vertice: Vertice, line: Line){
-        var verticeCopy = vertice.getCopy();
-        var lineCopy = line.getCopy();
+        var verticeCopy = vertice.clone();
+        var lineCopy = line.clone();
         var x0 = verticeCopy.x;
         var y0 = verticeCopy.y;
         var z0 = verticeCopy.z;
@@ -141,8 +141,8 @@ const MathUtils = {
      * @return {Number}
      */
     getLengthFromVerticeToPlan(vertice: Vertice, plan: Plan){
-        var verticeCopy = vertice.getCopy();
-        var planCopy = plan.getCopy();
+        var verticeCopy = vertice.clone();
+        var planCopy = plan.clone();
         var x = verticeCopy.x;
         var y = verticeCopy.y;
         var z = verticeCopy.z;
@@ -164,8 +164,8 @@ const MathUtils = {
      * @return {World.Vertice}
      */
     getVerticeVerticalIntersectPointWidthPlan(vertice: Vertice, plan: Plan){
-        var verticeCopy = vertice.getCopy();
-        var planCopy = plan.getCopy();
+        var verticeCopy = vertice.clone();
+        var planCopy = plan.clone();
         var x0 = verticeCopy.x;
         var y0 = verticeCopy.y;
         var z0 = verticeCopy.z;
@@ -184,8 +184,8 @@ const MathUtils = {
     },
 
     getIntersectPointByLineAdPlan(line: Line, plan: Plan){
-        var lineCopy = line.getCopy();
-        var planCopy = plan.getCopy();
+        var lineCopy = line.clone();
+        var planCopy = plan.clone();
         lineCopy.vector.normalize();
         var A = planCopy.A;
         var B = planCopy.B;
@@ -213,7 +213,7 @@ const MathUtils = {
      */
     getLineIntersectPointWithEarth(line: Line): Vertice[]{
         var result:Vertice[] = [];
-        var lineCopy = line.getCopy();
+        var lineCopy = line.clone();
         var vertice = lineCopy.vertice;
         var direction = lineCopy.vector;
         direction.normalize();
@@ -280,8 +280,8 @@ const MathUtils = {
      * @return {Object} World.Plan 返回平面表达式中Ax+By+Cz+D=0的A、B、C、D的信息
      */
     getCrossPlaneByLine(vertice: Vertice, direction: Vector): Plan{
-        var verticeCopy = vertice.getCopy();
-        var directionCopy = direction.getCopy();
+        var verticeCopy = vertice.clone();
+        var directionCopy = direction.clone();
         directionCopy.normalize();
         var a = directionCopy.x;
         var b = directionCopy.y;
@@ -361,7 +361,7 @@ const MathUtils = {
      * @return {Array}
      */
     cartesianCoordToGeographic(vertice: Vertice): number[]{
-        var verticeCopy = vertice.getCopy();
+        var verticeCopy = vertice.clone();
         var x = verticeCopy.x;
         var y = verticeCopy.y;
         var z = verticeCopy.z;
diff --git a/ts/world/Matrix.ts b/ts/world/Matrix.ts
index b4eaafa..455be11 100644
--- a/ts/world/Matrix.ts
+++ b/ts/world/Matrix.ts
@@ -226,7 +226,7 @@ class Matrix{
       return true;
     }
 
-    copy(): Matrix {
+    clone(): Matrix {
       return new Matrix(
           this.elements[0], this.elements[4], this.elements[8], this.elements[12],
           this.elements[1], this.elements[5], this.elements[9], this.elements[13],
diff --git a/ts/world/PerspectiveCamera.ts b/ts/world/PerspectiveCamera.ts
index 29a7011..546eb4f 100644
--- a/ts/world/PerspectiveCamera.ts
+++ b/ts/world/PerspectiveCamera.ts
@@ -104,9 +104,9 @@ class PerspectiveCamera extends Object3D{
     }
 
     look(cameraPnt: Vertice, targetPnt: Vertice, upDirection: Vector = new Vector(0, 1, 0)): void {
-      var cameraPntCopy = cameraPnt.getCopy();
-      var targetPntCopy = targetPnt.getCopy();
-      var up = upDirection.getCopy();
+      var cameraPntCopy = cameraPnt.clone();
+      var targetPntCopy = targetPnt.clone();
+      var up = upDirection.clone();
       var transX = cameraPntCopy.x;
       var transY = cameraPntCopy.y;
       var transZ = cameraPntCopy.z;
@@ -128,7 +128,7 @@ class PerspectiveCamera extends Object3D{
     }
 
     lookAt(targetPnt: Vertice, upDirection?: Vector): void {
-      var targetPntCopy = targetPnt.getCopy();
+      var targetPntCopy = targetPnt.clone();
       var position = this.getPosition();
       this.look(position, targetPntCopy, upDirection);
     }
@@ -173,7 +173,7 @@ class PerspectiveCamera extends Object3D{
       if (!(viewMatrix instanceof Matrix)) {
         viewMatrix = this.getViewMatrix();
       }
-      var verticeInCameraCopy = verticeInCamera.getCopy();
+      var verticeInCameraCopy = verticeInCamera.clone();
       var inverseMatrix = viewMatrix.getInverseMatrix();
       var column = [verticeInCameraCopy.x, verticeInCameraCopy.y, verticeInCameraCopy.z, 1];
       var column2 = inverseMatrix.multiplyColumn(column);
@@ -189,7 +189,7 @@ class PerspectiveCamera extends Object3D{
       if (!(viewMatrix instanceof Matrix)) {
         viewMatrix = this.getViewMatrix();
       }
-      var vectorInCameraCopy = vectorInCamera.getCopy();
+      var vectorInCameraCopy = vectorInCamera.clone();
       var verticeInCamera = vectorInCameraCopy.getVertice();
       var verticeInWorld = this.convertVerticeFromCameraToWorld(verticeInCamera, viewMatrix);
       var originInWorld = this.getPosition();
diff --git a/ts/world/Plan.ts b/ts/world/Plan.ts
index d443f88..51f6b8c 100644
--- a/ts/world/Plan.ts
+++ b/ts/world/Plan.ts
@@ -3,7 +3,7 @@ class Plan{
     constructor(public A: number, public B: number, public C: number, public D: number){
     }
 
-    getCopy(): Plan{
+    clone(): Plan{
         var planCopy = new Plan(this.A, this.B, this.C, this.D);
         return planCopy;
     }
diff --git a/ts/world/Ray.ts b/ts/world/Ray.ts
index eff4f7f..e79c12f 100644
--- a/ts/world/Ray.ts
+++ b/ts/world/Ray.ts
@@ -12,23 +12,23 @@ class Ray{
      * @constructor
      */
     constructor(position: Vertice, direction: Vector){
-        this.vertice = position.getCopy();
-        this.vector = direction.getCopy();
+        this.vertice = position.clone();
+        this.vector = direction.clone();
         this.vector.normalize();
     }
 
     setVertice(position: Vertice): Ray {
-        this.vertice = position.getCopy();
+        this.vertice = position.clone();
         return this;
     }
 
     setVector(direction: Vector): Ray {
-        this.vector = direction.getCopy();
+        this.vector = direction.clone();
         this.vector.normalize();
         return this;
     }
 
-    getCopy(): Ray {
+    clone(): Ray {
         var rayCopy = new Ray(this.vertice, this.vector);
         return rayCopy;
     }
diff --git a/ts/world/Vector.ts b/ts/world/Vector.ts
index ede387e..6c366a6 100644
--- a/ts/world/Vector.ts
+++ b/ts/world/Vector.ts
@@ -24,7 +24,7 @@ class Vector{
       return [this.x, this.y, this.z];
     }
 
-    getCopy(): Vector {
+    clone(): Vector {
       return new Vector(this.x, this.y, this.z);
     }
 
diff --git a/ts/world/Vertice.ts b/ts/world/Vertice.ts
index 369f273..c1b6cf7 100644
--- a/ts/world/Vertice.ts
+++ b/ts/world/Vertice.ts
@@ -25,7 +25,7 @@ class Vertice{
       return [this.x, this.y, this.z];
     }
 
-    getCopy(): Vertice {
+    clone(): Vertice {
       return new Vertice(this.x, this.y, this.z);
     }