diff --git a/UI/UI_global.c b/UI/UI_global.c
index 175b743..129cf61 100644
--- a/UI/UI_global.c
+++ b/UI/UI_global.c
@@ -847,7 +847,9 @@ void Draw_Bottom_Bar(uint8_t sel, uint8_t first_back)
 	uint8_t i;
 
 	(void)first_back;
-	LCD_FillByColor(0, 263, 240, 320, UI0902_BG_COLOR);
+	/* 从段落钮底边之下清屏，勿切掉按钮底圆角（钮 y=231..264） */
+	LCD_FillByColor(0, (uint16_t)(UI0902_SECTION_Y + UI0902_SECTION_BTN_H),
+	                240, 320, UI0902_BG_COLOR);
 	/* mode.png：段落钮与底栏之间横线分隔 */
 	LCD_DrawLine(0, UI0902_SEP_LINE_Y, 239, UI0902_SEP_LINE_Y, UI0902_SEP_LINE_COLOR);
 	LCD_DrawLine(0, UI0902_SEP_LINE_Y + 1, 239, UI0902_SEP_LINE_Y + 1, UI0902_SEP_LINE_COLOR);