diff --git a/Zframework/background.lua b/Zframework/background.lua
index a6ed2832..612f3824 100644
--- a/Zframework/background.lua
+++ b/Zframework/background.lua
@@ -34,17 +34,20 @@ function BG.setDefault(bg)
 end
 function BG.set(background)
 	if not background then background=BG.default end
-	if not BGs[background]or background==BG.cur or not SETTING.bg then return end
-	BG.discard()
-	BG.cur=background
-	background=BGs[background]
+	if not BGs[background]or not SETTING.bg then return end
+	if background~=BG.cur then
+		BG.discard()
+		BG.cur=background
+		background=BGs[background]
 
-	BG.init=	background.init or NULL
-	BG.resize=	background.resize or NULL
-	BG.update=	background.update or NULL
-	BG.draw=	background.draw or NULL
-	BG.event=	background.event or NULL
-	BG.discard=	background.discard or NULL
-	BG.init()
+		BG.init=	background.init or NULL
+		BG.resize=	background.resize or NULL
+		BG.update=	background.update or NULL
+		BG.draw=	background.draw or NULL
+		BG.event=	background.event or NULL
+		BG.discard=	background.discard or NULL
+		BG.init()
+	end
+	return true
 end
 return BG
\ No newline at end of file
diff --git a/Zframework/bgm.lua b/Zframework/bgm.lua
index bce0105b..acfb0d2a 100644
--- a/Zframework/bgm.lua
+++ b/Zframework/bgm.lua
@@ -63,17 +63,20 @@ function BGM.init(list)
 			if SETTING.bgm==0 then
 				BGM.nowPlay=s
 				BGM.playing=Sources[s]
-				return
+				return true
 			end
-			if s and Sources[s]and BGM.nowPlay~=s then
-				if BGM.nowPlay then TASK.new(fadeOut,BGM.playing)end
-				TASK.removeTask_iterate(removeCurFadeOut,fadeOut,Sources[s])
-				TASK.removeTask_code(fadeIn)
+			if s and Sources[s]then
+				if BGM.nowPlay~=s then
+					if BGM.nowPlay then TASK.new(fadeOut,BGM.playing)end
+					TASK.removeTask_iterate(removeCurFadeOut,fadeOut,Sources[s])
+					TASK.removeTask_code(fadeIn)
 
-				TASK.new(fadeIn,Sources[s])
-				BGM.nowPlay=s
-				BGM.playing=Sources[s]
-				BGM.playing:play()
+					TASK.new(fadeIn,Sources[s])
+					BGM.nowPlay=s
+					BGM.playing=Sources[s]
+					BGM.playing:play()
+				end
+				return true
 			end
 		end
 		function BGM.freshVolume()