diff --git a/engine/cocos2d/core/renderer/utils/label/letter-font.js b/engine/cocos2d/core/renderer/utils/label/letter-font.js
index 85dbd887..6c6ed6d8 100644
--- a/engine/cocos2d/core/renderer/utils/label/letter-font.js
+++ b/engine/cocos2d/core/renderer/utils/label/letter-font.js
@@ -459,8 +459,8 @@ class LetterAtlases {
                     fontDesc: labelInfo.fontDesc,
                     fontSize: labelInfo.fontSize,
                     margin: labelInfo.margin,
-                    out: labelInfo.out.toHEX(),
-                    color: labelInfo.color.toHEX(),
+                    out: labelInfo.out.toHEX('#rrggbbaa'),
+                    color: labelInfo.color.toHEX('#rrggbbaa'),
                     isOutlined: labelInfo.isOutlined,
                 };
                 Label._canvasPool.put(canvas);
@@ -549,10 +549,10 @@ class LetterAtlases {
 
 function computeHash (labelInfo) {
     let hashData = '|';
-    let color = labelInfo.color.toHEX();
+    let color = labelInfo.color.toHEX('#rrggbbaa');
     let out = '';
     if (labelInfo.isOutlined && labelInfo.margin > 0) {
-        out = out + labelInfo.margin + labelInfo.out.toHEX();
+        out = out + labelInfo.margin + labelInfo.out.toHEX('#rrggbbaa');
     }
 
     return hashData + labelInfo.fontSize + labelInfo.fontFamily + color + out;
diff --git a/engine/cocos2d/core/renderer/utils/label/ttf.js b/engine/cocos2d/core/renderer/utils/label/ttf.js
index 2eafce56..bd135768 100644
--- a/engine/cocos2d/core/renderer/utils/label/ttf.js
+++ b/engine/cocos2d/core/renderer/utils/label/ttf.js
@@ -101,7 +101,7 @@ export default class TTFAssembler extends Assembler2D {
 
     updateRenderData (comp) {
         super.updateRenderData(comp);
-        
+
         if (!comp._vertsDirty) return false;
 
         this._updateProperties(comp);
@@ -297,7 +297,7 @@ export default class TTFAssembler extends Assembler2D {
         if (_shadowComp) {
             this._setupShadow();
         }
-        
+
         if (_outlineComp) {
             this._setupOutline();
         }
@@ -387,19 +387,19 @@ export default class TTFAssembler extends Assembler2D {
             frame._texture._uuid = _fontDesc
                 + _overflow
                 + (_premultiply ? 'P' : 'NP')
-                + comp.node.color.toHEX()
+                + comp.node.color.toHEX('#rrggbbaa')
                 + (_enableUnderline ? 'UL' : 'NUL')
                 + _string;
 
             if (_outlineComp) {
-                frame._texture._uuid += _outlineComp.color.toHEX()
+                frame._texture._uuid += _outlineComp.color.toHEX('#rrggbbaa')
                     + ','
                     + _outlineComp.width
                     + ',';
             }
 
             if (_shadowComp) {
-                frame._texture._uuid += _shadowComp.color.toHEX()
+                frame._texture._uuid += _shadowComp.color.toHEX('#rrggbbaa')
                     + _shadowComp.offset.x
                     + ','
                     + _shadowComp.offset.y
@@ -476,7 +476,7 @@ export default class TTFAssembler extends Assembler2D {
 
     _calculateShrinkFont (paragraphedStrings) {
         let paragraphLength = this._calculateParagraphLength(paragraphedStrings, _context);
-        
+
         let i = 0;
         let totalHeight = 0;
         let maxLength = 0;