diff --git a/ExcelFile.tsf b/ExcelFile.tsf
index a5d6bd3..12abe50 100755
--- a/ExcelFile.tsf
+++ b/ExcelFile.tsf
@@ -126,9 +126,9 @@ Type ExcelFile = Class
 	///设置工作表背景图片
 	///picture: string，图片文件路径
 	///返回: [err, info]
-	Function SetSheetBackground(picture);
+	Function SetSheetBackground(sheet, picture);
 	Begin
-		return xlsx_call("SetSheetBackground", fh_, picture);
+		return xlsx_call("SetSheetBackground", fh_, sheet, picture);
 	End;
 	
 	///设置默认（活动）工作表