diff --git a/DemoProc/src/Resource.c b/DemoProc/src/Resource.c
index 533ca22..9793e42 100644
--- a/DemoProc/src/Resource.c
+++ b/DemoProc/src/Resource.c
@@ -7743,7 +7743,7 @@ const SGUI_CBYTE GB2312_H12[] = {
 
 const SGUI_FONT_RES SGUI_FONT(GB2312_FZXS12) = {
 	/*SGUI_INT                      iHeight*/               12,
-	/*SGUI_INT                      iDepthBits*/            1,
+	/*SGUI_UINT                     uiDepthBits*/           1,
 	/*SGUI_FN_IF_GET_DATA           fnGetBitmap*/           SGUI_Resource_GetBitmap_GB2312,
 	/*SGUI_FN_IF_STEP_NEXT          fnStepNext*/            SGUI_TEXT_DECODER_GB2312,
 };
@@ -7765,7 +7765,7 @@ void SGUI_Resource_GetBitmap_GB2312(SGUI_BMP_RES* pstBitmapData,SGUI_UINT32 uiCo
 
 	pstBitmapData->fnGetPixel   = SGUI_BMP_SCAN_MODE_DHPV;
 	pstBitmapData->iHeight      = pstFontRes->iHeight;
-	pstBitmapData->iDepthBits   = pstFontRes->iDepthBits;
+	pstBitmapData->uiDepthBits  = pstFontRes->uiDepthBits;
 
 	uiHighByte                  = (uiCode & 0xFF00)>>8;
 	uiLowByte                   = uiCode & 0x00FF;
diff --git a/GUI/inc/SGUI_ItemsBase.h b/GUI/inc/SGUI_ItemsBase.h
index 2b416cf..89363f1 100644
--- a/GUI/inc/SGUI_ItemsBase.h
+++ b/GUI/inc/SGUI_ItemsBase.h
@@ -17,7 +17,7 @@
 //= Data type definition.											    =//
 //=======================================================================//
 typedef struct {
-    SGUI_INT8                   uiDepthBits;
+    SGUI_UINT8                  uiDepthBits;
     SGUI_COLOR                  eTextColor;
     SGUI_COLOR                  eFocusTextColor;
     SGUI_COLOR                  eBackgroundColor;
diff --git a/GUI/inc/SGUI_Typedef.h b/GUI/inc/SGUI_Typedef.h
index 753dd71..af07663 100644
--- a/GUI/inc/SGUI_Typedef.h
+++ b/GUI/inc/SGUI_Typedef.h
@@ -40,9 +40,9 @@ static void SGUI_Resource_GetBitmap_##NAME(SGUI_BMP_RES* pBitmapData,SGUI_UINT32
 {\
     SGUI_INT iCharIndex = INDEXMAPPER(uiCode);\
     if(NULL != pBitmapData) {\
-        pBitmapData->iHeight    = SGUI_FONT_##NAME.iHeight;\
-        pBitmapData->iWidth     = WIDTH;\
-        pBitmapData->iDepthBits = SGUI_FONT_##NAME.iDepthBits;\
+        pBitmapData->iHeight     = SGUI_FONT_##NAME.iHeight;\
+        pBitmapData->iWidth      = WIDTH;\
+        pBitmapData->uiDepthBits = SGUI_FONT_##NAME.uiDepthBits;\
         if(!bDryRun) {\
             pBitmapData->fnGetPixel = SCANMODE;\
             pBitmapData->pData      = DATA_##NAME + iCharIndex*BLOCKSIZE;\
@@ -171,7 +171,7 @@ typedef struct _bmp_res
 {
 	SGUI_INT							iWidth;
     SGUI_INT							iHeight;
-    SGUI_INT                            iDepthBits;
+    SGUI_UINT8                          uiDepthBits;
     SGUI_FN_IF_BMP_GET_PIXEL            fnGetPixel;
     //SGUI_COLOR                          (*fnGetPixel)(const struct _bmp_res* pstBitmapData,SGUI_UINT8 uiX,SGUI_UINT8 uiY);
     const SGUI_BYTE*					pData;
@@ -185,7 +185,7 @@ SGUI_DEVPF_IF_DEFINE(void,              SGUI_FN_IF_GET_BITMAP,              (SGU
 typedef struct _font_res
 {
     SGUI_INT							iHeight;
-    SGUI_INT                            iDepthBits;
+    SGUI_UINT8                          uiDepthBits;
 	SGUI_FN_IF_GET_BITMAP               fnGetBitmap;
 	SGUI_FN_IF_STEP_NEXT                fnStepNext;
 }SGUI_FONT_RES;
diff --git a/GUI/src/SGUI_Basic.c b/GUI/src/SGUI_Basic.c
index d3dc217..3408f11 100644
--- a/GUI/src/SGUI_Basic.c
+++ b/GUI/src/SGUI_Basic.c
@@ -625,9 +625,9 @@ void SGUI_Basic_DrawAlphaBitMap(SGUI_SCR_DEV* pstDeviceIF, SGUI_RECT* pstDisplay
                         eAlpha = SGUI_Basic_BitMapScanDVPV(pstBitmapData,iBmpPixX,iBmpPixY);
                     }
 
-                    if(pstDeviceIF->uiDepthBits != pstBitmapData->iDepthBits)
+                    if(pstDeviceIF->uiDepthBits != pstBitmapData->uiDepthBits)
                     {
-                        eAlpha = SGUI_Basic_MapColor(pstBitmapData->iDepthBits,eAlpha,pstDeviceIF->uiDepthBits);
+                        eAlpha = SGUI_Basic_MapColor(pstBitmapData->uiDepthBits,eAlpha,pstDeviceIF->uiDepthBits);
                     }
 
                     eColor = SGUI_Basic_GetPoint(pstDeviceIF,iDrawPixX,iDrawPixY);
@@ -729,11 +729,11 @@ void SGUI_Basic_DrawBitMap(SGUI_SCR_DEV* pstDeviceIF, SGUI_RECT* pstDisplayArea,
 
 					if(eDrawMode == SGUI_DRAW_REVERSE)
 					{
-						eColor = SGUI_Basic_GetReverseColor(pstBitmapData->iDepthBits,eColor);
+						eColor = SGUI_Basic_GetReverseColor(pstBitmapData->uiDepthBits,eColor);
 					}
-					if(pstDeviceIF->uiDepthBits != pstBitmapData->iDepthBits)
+					if(pstDeviceIF->uiDepthBits != pstBitmapData->uiDepthBits)
 					{
-						eColor = SGUI_Basic_MapColor(pstBitmapData->iDepthBits,eColor,pstDeviceIF->uiDepthBits);
+						eColor = SGUI_Basic_MapColor(pstBitmapData->uiDepthBits,eColor,pstDeviceIF->uiDepthBits);
 					}
 					SGUI_Basic_DrawPoint(pstDeviceIF,iDrawPixX,iDrawPixY,eColor);
 					iDrawnHeightIndex ++;
@@ -773,19 +773,19 @@ SGUI_COLOR   SGUI_Basic_BitMapScanDHPH(const SGUI_BMP_RES* pstBitmapData,SGUI_UI
 	/* Initialize						*/
 	/*----------------------------------*/
 	eColor              = 0;
-	uiBytesPerRow       = (pstBitmapData->iWidth * pstBitmapData->iDepthBits + 7)/8;
+	uiBytesPerRow       = (pstBitmapData->iWidth * pstBitmapData->uiDepthBits + 7)/8;
 	pData               = pstBitmapData->pData;
 	/*----------------------------------*/
 	/* Process							*/
 	/*----------------------------------*/
-	if( pstBitmapData->iDepthBits == 1 ||
-        pstBitmapData->iDepthBits == 2 ||
-        pstBitmapData->iDepthBits == 4 ||
-        pstBitmapData->iDepthBits == 8 )
+	if( pstBitmapData->uiDepthBits == 1 ||
+        pstBitmapData->uiDepthBits == 2 ||
+        pstBitmapData->uiDepthBits == 4 ||
+        pstBitmapData->uiDepthBits == 8 )
 	{
-        pData += uiBytesPerRow * uiY + (uiX*pstBitmapData->iDepthBits)/8;
-        cTemp  = (*pData)>>((uiX*pstBitmapData->iDepthBits)%8);
-        eColor = cTemp & ((0x1<<pstBitmapData->iDepthBits)-1);
+        pData += uiBytesPerRow * uiY + (uiX*pstBitmapData->uiDepthBits)/8;
+        cTemp  = (*pData)>>((uiX*pstBitmapData->uiDepthBits)%8);
+        eColor = cTemp & ((0x1<<pstBitmapData->uiDepthBits)-1);
 	}
 	return eColor;
 }
@@ -821,16 +821,16 @@ SGUI_COLOR   SGUI_Basic_BitMapScanDHPV(const SGUI_BMP_RES* pstBitmapData,SGUI_UI
 	/*----------------------------------*/
 	/* Process							*/
 	/*----------------------------------*/
-	if( pstBitmapData->iDepthBits == 1 ||
-        pstBitmapData->iDepthBits == 2 ||
-        pstBitmapData->iDepthBits == 4 ||
-        pstBitmapData->iDepthBits == 8 )
+	if( pstBitmapData->uiDepthBits == 1 ||
+        pstBitmapData->uiDepthBits == 2 ||
+        pstBitmapData->uiDepthBits == 4 ||
+        pstBitmapData->uiDepthBits == 8 )
 	{
-		uiPixelPerByte      = 8 / pstBitmapData->iDepthBits;
+		uiPixelPerByte      = 8 / pstBitmapData->uiDepthBits;
 		uiByteRow           = uiY / uiPixelPerByte;
 		pData              += uiByteRow * pstBitmapData->iWidth + uiX;
-		cTemp               = (*pData)>>(uiY%uiPixelPerByte*pstBitmapData->iDepthBits);
-		eColor             |= cTemp & ((0x1<<pstBitmapData->iDepthBits)-1);
+		cTemp               = (*pData)>>(uiY%uiPixelPerByte*pstBitmapData->uiDepthBits);
+		eColor             |= cTemp & ((0x1<<pstBitmapData->uiDepthBits)-1);
 	}
 	return eColor;
 }
@@ -866,16 +866,16 @@ SGUI_COLOR   SGUI_Basic_BitMapScanDVPH(const SGUI_BMP_RES* pstBitmapData,SGUI_UI
 	/*----------------------------------*/
 	/* Process							*/
 	/*----------------------------------*/
-	if( pstBitmapData->iDepthBits == 1 ||
-        pstBitmapData->iDepthBits == 2 ||
-        pstBitmapData->iDepthBits == 4 ||
-        pstBitmapData->iDepthBits == 8 )
+	if( pstBitmapData->uiDepthBits == 1 ||
+        pstBitmapData->uiDepthBits == 2 ||
+        pstBitmapData->uiDepthBits == 4 ||
+        pstBitmapData->uiDepthBits == 8 )
 	{
-		uiPixelPerByte      = 8 / pstBitmapData->iDepthBits;
+		uiPixelPerByte      = 8 / pstBitmapData->uiDepthBits;
 		uiByteColumn        = uiX / uiPixelPerByte;
 		pData              += uiByteColumn * pstBitmapData->iHeight + uiY;
-		cTemp               = (*pData)>>(uiX%uiPixelPerByte*pstBitmapData->iDepthBits);
-		eColor             |= cTemp & ((0x1<<pstBitmapData->iDepthBits)-1);
+		cTemp               = (*pData)>>(uiX%uiPixelPerByte*pstBitmapData->uiDepthBits);
+		eColor             |= cTemp & ((0x1<<pstBitmapData->uiDepthBits)-1);
 	}
 	return eColor;
 }
@@ -906,19 +906,19 @@ SGUI_COLOR   SGUI_Basic_BitMapScanDVPV(const SGUI_BMP_RES* pstBitmapData,SGUI_UI
 	/* Initialize       				*/
 	/*----------------------------------*/
 	eColor = 0;
-	uiBytesPerColomn    = (pstBitmapData->iDepthBits * pstBitmapData->iHeight + 7)/8;
+	uiBytesPerColomn    = (pstBitmapData->uiDepthBits * pstBitmapData->iHeight + 7)/8;
 	pData               = pstBitmapData->pData;
 	/*----------------------------------*/
 	/* Process          				*/
 	/*----------------------------------*/
-	if( pstBitmapData->iDepthBits == 1 ||
-	        pstBitmapData->iDepthBits == 2 ||
-	        pstBitmapData->iDepthBits == 4 ||
-	        pstBitmapData->iDepthBits == 8 )
+	if( pstBitmapData->uiDepthBits == 1 ||
+	        pstBitmapData->uiDepthBits == 2 ||
+	        pstBitmapData->uiDepthBits == 4 ||
+	        pstBitmapData->uiDepthBits == 8 )
 	{
-	    pData += uiBytesPerColomn * uiX + (uiY*pstBitmapData->iDepthBits)/8;
-	    cTemp  = (*pData) >> ((uiY*pstBitmapData->iDepthBits)%8);
-	    eColor = cTemp & ((0x01 << pstBitmapData->iDepthBits)-1);
+	    pData += uiBytesPerColomn * uiX + (uiY*pstBitmapData->uiDepthBits)/8;
+	    cTemp  = (*pData) >> ((uiY*pstBitmapData->uiDepthBits)%8);
+	    eColor = cTemp & ((0x01 << pstBitmapData->uiDepthBits)-1);
 	}
 	return eColor;
 }