diff --git a/cocos/2d/CCLabel.cpp b/cocos/2d/CCLabel.cpp
index 27329913b0..e9bae0ca6a 100644
--- a/cocos/2d/CCLabel.cpp
+++ b/cocos/2d/CCLabel.cpp
@@ -245,10 +245,10 @@ Label::Label(FontAtlas *atlas /* = nullptr */, TextHAlignment hAlignment /* = Te
 , _commonLineHeight(0.0f)
 , _lineBreakWithoutSpaces(false)
 , _horizontalKernings(nullptr)
-, _maxLineWidth(0)
+, _maxLineWidth(0.0f)
 , _labelDimensions(Size::ZERO)
-, _labelWidth(0)
-, _labelHeight(0)
+, _labelWidth(0.0f)
+, _labelHeight(0.0f)
 , _hAlignment(hAlignment)
 , _vAlignment(vAlignment)
 , _currNumLines(-1)
@@ -496,7 +496,7 @@ void Label::setAlignment(TextHAlignment hAlignment,TextVAlignment vAlignment)
     }
 }
 
-void Label::setMaxLineWidth(unsigned int maxLineWidth)
+void Label::setMaxLineWidth(float maxLineWidth)
 {
     if (_labelWidth == 0 && _maxLineWidth != maxLineWidth)
     {
@@ -505,7 +505,7 @@ void Label::setMaxLineWidth(unsigned int maxLineWidth)
     }
 }
 
-void Label::setDimensions(unsigned int width, unsigned int height)
+void Label::setDimensions(float width, float height)
 {
     if (height != _labelHeight || width != _labelWidth)
     {
diff --git a/cocos/2d/CCLabel.h b/cocos/2d/CCLabel.h
index 02844fa5f4..e6d7c4715b 100644
--- a/cocos/2d/CCLabel.h
+++ b/cocos/2d/CCLabel.h
@@ -183,25 +183,25 @@ public:
      * The label's max line width be used for force line breaks if the set value not equal zero.
      * The label's width and max line width has not always to be equal.
      */
-    void setMaxLineWidth(unsigned int maxLineWidth);
-    unsigned int getMaxLineWidth() { return _maxLineWidth;}
+    void setMaxLineWidth(float maxLineWidth);
+    float getMaxLineWidth() { return _maxLineWidth; }
 
     /** Sets the untransformed size of the label.
      * The label's width be used for text align if the set value not equal zero.
      * The label's max line width will be equal to the same value.
      */
-    void setWidth(unsigned int width) { setDimensions(width,_labelHeight);}
-    unsigned int getWidth() const { return _labelWidth; }  
+    void setWidth(float width) { setDimensions(width,_labelHeight);}
+    float getWidth() const { return _labelWidth; }
 
     /** Sets the untransformed size of the label.
      * The label's height be used for text align if the set value not equal zero.
      * The text will display of incomplete when the size of label not enough to support display all text.
      */
-    void setHeight(unsigned int height){ setDimensions(_labelWidth,height);}
-    unsigned int getHeight() const { return _labelHeight;}   
+    void setHeight(float height){ setDimensions(_labelWidth, height); }
+    float getHeight() const { return _labelHeight; }
 
     /** Sets the untransformed size of the label in a more efficient way. */
-    void setDimensions(unsigned int width,unsigned int height);
+    void setDimensions(float width, float height);
     const Size& getDimensions() const{ return _labelDimensions;}
 
     /** update content immediately.*/
@@ -365,10 +365,10 @@ protected:
     bool  _lineBreakWithoutSpaces;
     int * _horizontalKernings;
 
-    unsigned int _maxLineWidth;
-    Size         _labelDimensions;
-    unsigned int _labelWidth;
-    unsigned int _labelHeight;
+    float _maxLineWidth;
+    Size  _labelDimensions;
+    float _labelWidth;
+    float _labelHeight;
     TextHAlignment _hAlignment;
     TextVAlignment _vAlignment;
 
diff --git a/cocos/platform/mac/CCDevice-mac.mm b/cocos/platform/mac/CCDevice-mac.mm
index f1c01c0c3c..fa067c566a 100644
--- a/cocos/platform/mac/CCDevice-mac.mm
+++ b/cocos/platform/mac/CCDevice-mac.mm
@@ -132,9 +132,9 @@ static bool _initWithString(const char * text, Device::TextAlign align, const ch
                         lastBreakLocation = i + insertCount;
                     }
                     textSize = [lineBreak sizeWithAttributes:tokenAttributesDict];
-                    if(info->height > 0 && textSize.height > info->height)
+                    if(info->height > 0 && (int)textSize.height > info->height)
                         break;
-					if (textSize.width > info->width) {
+                    if ((int)textSize.width > info->width) {
                         if(lastBreakLocation > 0) {
                             [lineBreak insertString:@"\r" atIndex:lastBreakLocation];
                             lastBreakLocation = 0;