diff --git a/Demo_C/Demo/LED/LED.c b/Demo_C/Demo/LED/LED.c
index aa9e246..f6bc091 100644
--- a/Demo_C/Demo/LED/LED.c
+++ b/Demo_C/Demo/LED/LED.c
@@ -9,7 +9,8 @@
 
 static unsigned long cur_time;
 static unsigned long prev_time;
-static enum {GREEN, RED, BLUE} stage;
+enum color_pin {GREEN, RED, BLUE};
+enum color_pin pin;
 static int lamp_idx;
 static int n_loops;
 static int wait;
@@ -21,7 +22,7 @@ void PrgInit
 )
 {
     prev_time = 0;
-    stage = GREEN;
+    pin = GREEN;
     lamp_idx = BEG_LAMP_IDX;
     n_loops = 10;
     wait = 1000;
@@ -46,30 +47,31 @@ int PrgTic
         if(cur_time-prev_time>=wait)
         {
             prev_time = cur_time;
-            p_ta->output.duty[stage-1] = LIGHT_OFF;
-            p_ta->output.duty[stage] = LIGHT_MAX;
             p_ta->hook_table.DisplayMsg(p_ta, NULL);
 
-            switch(stage)
+            switch(pin)
             {
                 case GREEN:
                     p_ta->hook_table.DisplayMsg(p_ta, "GREEN");
+                    p_ta->output.duty[BLUE] = LIGHT_OFF;
+                    p_ta->output.duty[GREEN] = LIGHT_MAX;
                     break;
                 case RED:
                     p_ta->hook_table.DisplayMsg(p_ta, "RED");
+                    p_ta->output.duty[GREEN] = LIGHT_OFF;
+                    p_ta->output.duty[RED] = LIGHT_MAX;
                     break;
                 case BLUE:
                     p_ta->hook_table.DisplayMsg(p_ta, "BLUE");
-                    break;
+                    p_ta->output.duty[RED] = LIGHT_OFF;
+                    p_ta->output.duty[BLUE] = LIGHT_MAX;
                 default:
                     p_ta->hook_table.DisplayMsg(p_ta, NULL);
             }
 
-            if(++stage>END_LAMP_IDX)
+            if(++pin>END_LAMP_IDX)
             {
-                stage = 0;
-                p_ta->output.duty[END_LAMP_IDX] = LIGHT_OFF;
-                // p_ta->output.duty[lamp_idx] = LIGHT_MAX;
+                pin = GREEN;
                 return rc;
             }
         }