diff --git a/assets/effects/sprite-gray.effect b/assets/effects/sprite-gray.effect
index b7e248a..50e1327 100644
--- a/assets/effects/sprite-gray.effect
+++ b/assets/effects/sprite-gray.effect
@@ -1,9 +1,9 @@
 // Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.  
-// 老照片特效
+// 灰化特效
 // 原理：
-// r = 0.393 * r + 0.769 * g + 0.189 * b; 
-// g = 0.349 * r + 0.686 * g + 0.168 * b; 
-// b = 0.272 * r + 0.534 * g + 0.131 * b;
+// r = 0.2126 * r + 0.7152 * g + 0.0722 * b
+// g = 0.2126 * r + 0.7152 * g + 0.0722 * b
+// b = 0.2126 * r + 0.7152 * g + 0.0722 * b
 
 CCEffect %{
   techniques:
@@ -18,11 +18,11 @@ CCEffect %{
       properties:
         texture: { value: white }
         alphaThreshold: { value: 0.5 }
-        # 老化程度
-        oldLevel: {
+        # 灰化程度
+        grayLevel: {
           value: 1.0,
           inspector: {
-            tooltip: "老化程度",
+            tooltip: "灰化程度",
             range: [0.0, 1.0]
           }
         }
@@ -76,24 +76,10 @@ CCProgram fs %{
   uniform sampler2D texture;
   #endif
 
-  #if USE_OLD_PHOTO
-  uniform OldPhoto {
-    // 老化程度
-    float oldLevel;
-  }
-
-  /**
-   * 获取老化颜色
-   * 
-   * @param color 原始颜色 
-   *
-   * @return 老化后的颜色
-   */
-  vec4 getOldPhotoColor(vec4 color) {
-    float r = 0.393 * color.r + 0.769 * color.g + 0.189 * color.b; 
-    float g = 0.349 * color.r + 0.686 * color.g + 0.168 * color.b; 
-    float b = 0.272 * color.r + 0.534 * color.g + 0.131 * color.b;
-    return vec4(r, g, b, color.a);
+  #if USE_GRAY
+  uniform GrayPhoto {
+    // 灰化程度
+    float grayLevel;
   }
   #endif
 
@@ -111,11 +97,13 @@ CCProgram fs %{
 
     ALPHA_TEST(o);
 
-    #if USE_OLD_PHOTO
+    #if USE_GRAY
     vec4 srcColor = o;
-    vec4 oldColor = getOldPhotoColor(srcColor);
 
-    o = srcColor + (oldColor - srcColor) * oldLevel;
+    float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;
+    vec4 grayColor = vec4(gray, gray, gray, o.a);
+
+    o = srcColor + (grayColor - srcColor) * grayLevel;
     #endif
     gl_FragColor = o;
   }
diff --git a/assets/effects/sprite-gray.effect.meta b/assets/effects/sprite-gray.effect.meta
index 65e8bc1..c6f3b27 100644
--- a/assets/effects/sprite-gray.effect.meta
+++ b/assets/effects/sprite-gray.effect.meta
@@ -5,11 +5,11 @@
     {
       "glsl1": {
         "vert": "\nprecision highp float;\nuniform mat4 cc_matViewProj;\nuniform mat4 cc_matWorld;\n\nattribute vec3 a_position;\nattribute vec4 a_color;\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nattribute vec2 a_uv0;\nvarying vec2 v_uv0;\n#endif\n\nvoid main () {\n  vec4 pos = vec4(a_position, 1);\n\n  #if CC_USE_MODEL\n  pos = cc_matViewProj * cc_matWorld * pos;\n  #else\n  pos = cc_matViewProj * pos;\n  #endif\n\n  #if USE_TEXTURE\n  v_uv0 = a_uv0;\n  #endif\n\n  v_color = a_color;\n\n  gl_Position = pos;\n}\n",
-        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform float alphaThreshold;\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if USE_OLD_PHOTO\nuniform float oldLevel;\n/**\n * 获取老化颜色\n * \n * @param color 原始颜色 \n *\n * @return 老化后的颜色\n */\nvec4 getOldPhotoColor(vec4 color) {\n  float r = 0.393 * color.r + 0.769 * color.g + 0.189 * color.b; \n  float g = 0.349 * color.r + 0.686 * color.g + 0.168 * color.b; \n  float b = 0.272 * color.r + 0.534 * color.g + 0.131 * color.b;\n  return vec4(r, g, b, color.a);\n}\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture2D(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if USE_OLD_PHOTO\n  vec4 srcColor = o;\n  vec4 oldColor = getOldPhotoColor(srcColor);\n\n  o = srcColor + (oldColor - srcColor) * oldLevel;\n  #endif\n  gl_FragColor = o;\n}\n"
+        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform float alphaThreshold;\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if USE_GRAY\nuniform float grayLevel;\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture2D(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if USE_GRAY\n  vec4 srcColor = o;\n\n  float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n  vec4 grayColor = vec4(gray, gray, gray, o.a);\n\n  o = srcColor + (grayColor - srcColor) * grayLevel;\n  #endif\n  gl_FragColor = o;\n}\n"
       },
       "glsl3": {
         "vert": "\nprecision highp float;\nuniform CCGlobal {\n  vec4 cc_time;\n\n  vec4 cc_screenSize;\n\n  vec4 cc_screenScale;\n\n  vec4 cc_nativeSize;\n\n  mat4 cc_matView;\n  mat4 cc_matViewInv;\n  mat4 cc_matProj;\n  mat4 cc_matProjInv;\n  mat4 cc_matViewProj;\n  mat4 cc_matViewProjInv;\n  vec4 cc_cameraPos;\n\n  vec4 cc_exposure;\n\n  vec4 cc_mainLitDir;\n\n  vec4 cc_mainLitColor;\n\n  vec4 cc_ambientSky;\n  vec4 cc_ambientGround;\n};\nuniform CCLocal {\n  mat4 cc_matWorld;\n  mat4 cc_matWorldIT;\n};\n\nin vec3 a_position;\nin vec4 a_color;\nout vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 a_uv0;\nout vec2 v_uv0;\n#endif\n\nvoid main () {\n  vec4 pos = vec4(a_position, 1);\n\n  #if CC_USE_MODEL\n  pos = cc_matViewProj * cc_matWorld * pos;\n  #else\n  pos = cc_matViewProj * pos;\n  #endif\n\n  #if USE_TEXTURE\n  v_uv0 = a_uv0;\n  #endif\n\n  v_color = a_color;\n\n  gl_Position = pos;\n}\n",
-        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform ALPHA_TEST {\n    float alphaThreshold;\n  }\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nin vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if USE_OLD_PHOTO\nuniform OldPhoto {\n\n  float oldLevel;\n}\n\n/**\n * 获取老化颜色\n * \n * @param color 原始颜色 \n *\n * @return 老化后的颜色\n */\nvec4 getOldPhotoColor(vec4 color) {\n  float r = 0.393 * color.r + 0.769 * color.g + 0.189 * color.b; \n  float g = 0.349 * color.r + 0.686 * color.g + 0.168 * color.b; \n  float b = 0.272 * color.r + 0.534 * color.g + 0.131 * color.b;\n  return vec4(r, g, b, color.a);\n}\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if USE_OLD_PHOTO\n  vec4 srcColor = o;\n  vec4 oldColor = getOldPhotoColor(srcColor);\n\n  o = srcColor + (oldColor - srcColor) * oldLevel;\n  #endif\n  gl_FragColor = o;\n}\n"
+        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform ALPHA_TEST {\n    float alphaThreshold;\n  }\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nin vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if USE_GRAY\nuniform GrayPhoto {\n\n  float grayLevel;\n}\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if USE_GRAY\n  vec4 srcColor = o;\n\n  float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n  vec4 grayColor = vec4(gray, gray, gray, o.a);\n\n  o = srcColor + (grayColor - srcColor) * grayLevel;\n  #endif\n  gl_FragColor = o;\n}\n"
       }
     }
   ],
diff --git a/assets/materials/sprite-gray.mtl b/assets/materials/sprite-gray.mtl
index 2166632..b6eb2a7 100644
--- a/assets/materials/sprite-gray.mtl
+++ b/assets/materials/sprite-gray.mtl
@@ -8,7 +8,7 @@
   },
   "_defines": {
     "USE_TEXTURE": true,
-    "USE_OLD_PHOTO": true
+    "USE_GRAY": true
   },
   "_props": {}
 }
\ No newline at end of file
diff --git a/assets/scripts/GrayEffectScene.ts b/assets/scripts/GrayEffectScene.ts
index 3c2b741..1a4b1ab 100644
--- a/assets/scripts/GrayEffectScene.ts
+++ b/assets/scripts/GrayEffectScene.ts
@@ -31,7 +31,7 @@ export default class GrayEffectScene extends cc.Component {
 
         // 更新材质
         this._updateRenderComponentMaterial({
-            oldLevel: this._grayLevelSlider.progress
+            grayLevel: this._grayLevelSlider.progress
         });
     }
 
@@ -46,12 +46,12 @@ export default class GrayEffectScene extends cc.Component {
         /**
          * 灰化程度 [0.0, 1.0] ，1.0 表示完全灰化
          */
-        oldLevel: number;
+        grayLevel: number;
     }) {
         this._examplesParentNode.children.forEach(childNode => {
             childNode.getComponents(cc.RenderComponent).forEach(renderComponent => {
                 let material: cc.Material = renderComponent.getMaterial(0);
-                material.setProperty("oldLevel", param.oldLevel);
+                material.setProperty("grayLevel", param.grayLevel);
                 renderComponent.setMaterial(0, material);
             });
         });