diff --git a/engine/cocos2d/core/assets/material/effect-variant.ts b/engine/cocos2d/core/assets/material/effect-variant.ts
index 5623ed1c..ba22a926 100644
--- a/engine/cocos2d/core/assets/material/effect-variant.ts
+++ b/engine/cocos2d/core/assets/material/effect-variant.ts
@@ -75,7 +75,7 @@ export default class EffectVariant extends EffectBase {
 
         let effect = this._effect;
         if (effect) {
-            hash += utils.serializePasses(effect.passes);
+            hash += effect._id;
         }
 
         this._hash = murmurhash2(hash, 666);
diff --git a/engine/cocos2d/core/assets/material/effect.ts b/engine/cocos2d/core/assets/material/effect.ts
index b0327e0e..73a71041 100644
--- a/engine/cocos2d/core/assets/material/effect.ts
+++ b/engine/cocos2d/core/assets/material/effect.ts
@@ -7,6 +7,8 @@ export default class Effect extends EffectBase {
 
     _techniques: Technique[] = [];
     _asset = null;
+    static id = 0;
+    _id = '';
     
     get technique () {
         return this._technique;
@@ -22,6 +24,7 @@ export default class Effect extends EffectBase {
     constructor (name, techniques, techniqueIndex, asset) {
         super();
         this.init(name, techniques, techniqueIndex, asset, true);
+        this._id = '|' + Effect.id++;
     }
 
     init (name, techniques, techniqueIndex, asset, createNative) {
diff --git a/engine/cocos2d/core/assets/material/utils.js b/engine/cocos2d/core/assets/material/utils.js
index 52767efa..f72941c3 100644
--- a/engine/cocos2d/core/assets/material/utils.js
+++ b/engine/cocos2d/core/assets/material/utils.js
@@ -18,12 +18,14 @@ import enums from '../../../renderer/enums';
 const hashArray = [];
 
 function serializeDefines (defines, names) {
-    const len = names.length;
-    for (let i = 0; i < len; i++) {
-        const name = names[i];
-        hashArray[i] = name + defines[name];
+    let i = 0;
+    for (const name in defines) {
+        if (Object.hasOwnProperty.call(defines, name)) {
+            hashArray[i] = name + defines[name];
+            i++;
+        }
     }
-    hashArray.length = len;
+    hashArray.length = i;
     return hashArray.join('');
 }
 
@@ -63,21 +65,23 @@ function serializePasses (passes) {
 
 function serializeUniforms (uniforms, names) {
     let index = 0;
-    for (let i = 0, len = names.length; i < len; i++) {
-        let param = uniforms[names[i]];
-        let prop = param.value;
+    for (const name in uniforms) {
+        if (Object.hasOwnProperty.call(uniforms, name)) {
+            const param = uniforms[name];
+            let prop = param.value;
 
-        if (!prop) {
-            continue;
-        }
+            if (!prop) {
+                continue;
+            }
 
-        if (param.type === enums.PARAM_TEXTURE_2D || param.type === enums.PARAM_TEXTURE_CUBE) {
-            hashArray[index] = prop._id;
+            if (param.type === enums.PARAM_TEXTURE_2D || param.type === enums.PARAM_TEXTURE_CUBE) {
+                hashArray[index] = prop._id;
+            }
+            else {
+                hashArray[index] = prop.toString();
+            }
+            index++;
         }
-        else {
-            hashArray[index] = prop.toString();
-        }
-        index++
     }
     hashArray.length = index;
     return hashArray.join(';');