diff --git a/project/example/ble/ble_peripheral/app/src/Mode.c b/project/example/ble/ble_peripheral/app/src/Mode.c
index cef5cdc..f61380a 100644
--- a/project/example/ble/ble_peripheral/app/src/Mode.c
+++ b/project/example/ble/ble_peripheral/app/src/Mode.c
@@ -84,26 +84,29 @@ void set_mode(){
 				W_PWM=1U; C_PWM=1U; driveMode=0U; direction=0U; Mode=mode1;
 				break;
 			case 6:
-				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=1U; Mode=mode1;
+				W_PWM=1U; C_PWM=0U; driveMode=1U; direction=0U; Mode=mode1;
 				break;
 			case 7:
 				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=1U; Mode=mode3;
 				break;
 			case 8:
-				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=1U; Mode=mode2;
+				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=0U; Mode=mode3;
 				break;
 			case 9:
-				W_PWM=0U; C_PWM=100U; driveMode=2U; direction=1U; Mode=mode2;
+				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=1U; Mode=mode2;
 				break;
 			case 10:
-				W_PWM=50U; C_PWM=50U; driveMode=0U; direction=1U; Mode=mode2;
+				W_PWM=0U; C_PWM=100U; driveMode=2U; direction=1U; Mode=mode2;
 				break;
 			case 11:
-				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=2U; Mode=mode2;
+				W_PWM=50U; C_PWM=50U; driveMode=0U; direction=1U; Mode=mode2;
 				break;
 			case 12:
 				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=2U; Mode=mode2;
 				break;
+			case 13:
+				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=2U; Mode=mode2;
+				break;
 			case CUSTOM_TEMPERATURE_MODE:
 				Mode=mode0;
 				break;
@@ -151,6 +154,7 @@ void Mode0(){ //
 #define THREE_COLOR_WAIT_NEUTRAL 6U
 #define THREE_COLOR_WAIT_COLD    7U
 #define THREE_COLOR_WAIT_WARM    8U
+#define OVERLAP_GRADIENT_LEVEL   40U
 
 static uint8_t breathespeed_flag=0; //该变量只是用来处理三种颜色呼吸时候，对中性光的速度变大
 static void breathe_fun(uint16_t *PWM_1, uint16_t *PWM_2, uint8_t flag) {
@@ -294,13 +298,13 @@ void jump_fun(uint16_t *PWM_1, uint16_t *PWM_2, uint8_t flag){
 
 void Mode2(void)
 {
-	if(choose_mode_falsg==8U){
+	if(choose_mode_falsg==9U){
 		jump_fun(&C_PWM,&W_PWM,0U);
-	}else if(choose_mode_falsg==9U){
-		jump_fun(&W_PWM,&C_PWM,0U);
 	}else if(choose_mode_falsg==10U){
-		jump_fun(&W_PWM,&C_PWM,1U);
+		jump_fun(&W_PWM,&C_PWM,0U);
 	}else if(choose_mode_falsg==11U){
+		jump_fun(&W_PWM,&C_PWM,1U);
+	}else if(choose_mode_falsg==12U){
 		switch(direction){
 			case 1U:
 				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=2U;
@@ -312,7 +316,7 @@ void Mode2(void)
 				W_PWM=50U; C_PWM=50U; driveMode=0U; direction=1U;
 				break;
 		}
-	}else if(choose_mode_falsg==12U){
+	}else if(choose_mode_falsg==13U){
 		switch(direction){
 			case 1U:
 				W_PWM=100U; C_PWM=0U; driveMode=1U; direction=2U;
@@ -338,15 +342,52 @@ void Mode2(void)
 
 void Mode3(void)
 {
-	if(choose_mode_falsg!=7U) return;
-	if(direction==1U){
-		if(C_PWM<100U) C_PWM++;
-		W_PWM=100U-C_PWM;
-		if(C_PWM>=100U){ C_PWM=100U; W_PWM=0U; direction=0U; }
+	if(choose_mode_falsg==7U){
+		if(direction==1U){
+			if(C_PWM<100U) C_PWM++;
+			W_PWM=100U-C_PWM;
+			if(C_PWM>=100U){ C_PWM=100U; W_PWM=0U; direction=0U; }
+		}else{
+			if(C_PWM>0U) C_PWM--;
+			W_PWM=100U-C_PWM;
+			if(C_PWM==0U){ W_PWM=100U; direction=1U; }
+		}
+	}else if(choose_mode_falsg==8U){
+		switch(direction){
+			case 0U:
+				C_PWM=0U; driveMode=1U;
+				if(W_PWM>OVERLAP_GRADIENT_LEVEL) W_PWM--;
+				if(W_PWM<=OVERLAP_GRADIENT_LEVEL){ W_PWM=OVERLAP_GRADIENT_LEVEL; direction=1U; }
+				break;
+			case 1U:
+				if(W_PWM>0U){ W_PWM--; C_PWM++; }
+				driveMode=0U;
+				if(W_PWM==0U){ C_PWM=OVERLAP_GRADIENT_LEVEL; driveMode=2U; direction=2U; }
+				break;
+			case 2U:
+				W_PWM=0U; driveMode=2U;
+				if(C_PWM<100U) C_PWM++;
+				if(C_PWM>=100U){ C_PWM=100U; direction=3U; }
+				break;
+			case 3U:
+				W_PWM=0U; driveMode=2U;
+				if(C_PWM>OVERLAP_GRADIENT_LEVEL) C_PWM--;
+				if(C_PWM<=OVERLAP_GRADIENT_LEVEL){ C_PWM=OVERLAP_GRADIENT_LEVEL; direction=4U; }
+				break;
+			case 4U:
+				if(C_PWM>0U){ C_PWM--; W_PWM++; }
+				driveMode=0U;
+				if(C_PWM==0U){ W_PWM=OVERLAP_GRADIENT_LEVEL; driveMode=1U; direction=5U; }
+				break;
+			case 5U:
+			default:
+				C_PWM=0U; driveMode=1U;
+				if(W_PWM<100U) W_PWM++;
+				if(W_PWM>=100U){ W_PWM=100U; direction=0U; }
+				break;
+		}
 	}else{
-		if(C_PWM>0U) C_PWM--;
-		W_PWM=100U-C_PWM;
-		if(C_PWM==0U){ W_PWM=100U; direction=1U; }
+		return;
 	}
 	if(C_PWM==0U) driveMode=1U;
 	else if(W_PWM==0U) driveMode=2U;
diff --git a/project/example/ble/ble_peripheral/app/src/Mode.h b/project/example/ble/ble_peripheral/app/src/Mode.h
index ae91f73..9c6ce32 100644
--- a/project/example/ble/ble_peripheral/app/src/Mode.h
+++ b/project/example/ble/ble_peripheral/app/src/Mode.h
@@ -14,8 +14,8 @@ extern "C" {
 typedef void (*pfunc)(void);
 
 #define EFFECT_MODE_MIN         0U
-#define EFFECT_MODE_MAX         12U
-#define CUSTOM_TEMPERATURE_MODE 13U
+#define EFFECT_MODE_MAX         13U
+#define CUSTOM_TEMPERATURE_MODE 14U
 
 
 extern uint8_t deviceStatus;  //开机标志位
diff --git a/project/example/ble/ble_peripheral/app/src/bridge_pwm.c b/project/example/ble/ble_peripheral/app/src/bridge_pwm.c
index ba78776..2faf280 100644
--- a/project/example/ble/ble_peripheral/app/src/bridge_pwm.c
+++ b/project/example/ble/ble_peripheral/app/src/bridge_pwm.c
@@ -492,8 +492,22 @@ __RAM_CODE void Bridge_Service_1ms(void)
          * split evenly between W->C and C->W, which both absorbs interrupt
          * latency and spreads the two optical pulses across the 500 us frame.
          */
-        total_on_us = (BRIDGE_DUAL_ACTIVE_US * total +
-                       (BRIDGE_MIX_SCALE / 2U)) / BRIDGE_MIX_SCALE;
+        if (Mode == mode3 && choose_mode_falsg == 8U) {
+            /*
+             * The overlap gradient intentionally carries only 40% combined
+             * output through its crossover. Base that section on the complete
+             * 500 us frame so entering/leaving dual output does not create a
+             * 10% brightness step. The 450 us safety ceiling still applies.
+             */
+            total_on_us = (BRIDGE_FRAME_US * total +
+                           (BRIDGE_MIX_SCALE / 2U)) / BRIDGE_MIX_SCALE;
+            if (total_on_us > BRIDGE_DUAL_ACTIVE_US) {
+                total_on_us = BRIDGE_DUAL_ACTIVE_US;
+            }
+        } else {
+            total_on_us = (BRIDGE_DUAL_ACTIVE_US * total +
+                           (BRIDGE_MIX_SCALE / 2U)) / BRIDGE_MIX_SCALE;
+        }
         /* Keep a non-zero timer interval without imposing a brightness floor. */
         if (total_on_us < (2U * BRIDGE_MIN_DUAL_PULSE_US)) {
             total_on_us = 2U * BRIDGE_MIN_DUAL_PULSE_US;
diff --git a/project/example/ble/ble_peripheral/app/src/fmc_spi.c b/project/example/ble/ble_peripheral/app/src/fmc_spi.c
index 326b05f..ddc31c6 100644
--- a/project/example/ble/ble_peripheral/app/src/fmc_spi.c
+++ b/project/example/ble/ble_peripheral/app/src/fmc_spi.c
@@ -71,6 +71,8 @@ unsigned char get_checksum(unsigned char *ptrdata, unsigned char length)
 
 #define FLASH_BRIGHTNESS_FORMAT_INDEX  14U
 #define FLASH_BRIGHTNESS_PERCENT_MARK  0xA5U
+#define FLASH_MODE_LAYOUT_INDEX        26U
+#define FLASH_MODE_LAYOUT_MARK         0xA6U
 
 void read_user_data(void)
 {
@@ -131,6 +133,12 @@ void read_user_data(void)
 				adress_H_array[4]=r_data[24]; 
 				adress_L_array[4]=r_data[25];
 				choose_mode_falsg=r_data[30];
+				/* Preserve old mode meanings after inserting new mode 9. */
+				if(r_data[FLASH_MODE_LAYOUT_INDEX] != FLASH_MODE_LAYOUT_MARK &&
+				   choose_mode_falsg >= 8U && choose_mode_falsg <= 13U)
+				{
+					choose_mode_falsg++;
+				}
 				if(choose_mode_falsg > CUSTOM_TEMPERATURE_MODE)
 					choose_mode_falsg = EFFECT_MODE_MIN;
 				//choose_mode_bh=r_data[31];
@@ -178,7 +186,7 @@ void wright_user_data(void)
 		app_data[23]=adress_L_array[3];
 		app_data[24]=adress_H_array[4];
 		app_data[25]=adress_L_array[4];
-		app_data[26]=0;
+		app_data[FLASH_MODE_LAYOUT_INDEX]=FLASH_MODE_LAYOUT_MARK;
 		app_data[27]=0;
 		app_data[28]=0;	
 		app_data[29]=0;
diff --git a/project/example/ble/ble_peripheral/app/src/light_transition.c b/project/example/ble/ble_peripheral/app/src/light_transition.c
index 3acd90c..3660dec 100644
--- a/project/example/ble/ble_peripheral/app/src/light_transition.c
+++ b/project/example/ble/ble_peripheral/app/src/light_transition.c
@@ -103,7 +103,8 @@ static uint16_t output_brightness_scale_for_level(uint8_t level)
     if(level < BRIGHTNESS_MIN_PERCENT) level = BRIGHTNESS_MIN_PERCENT;
     if(level > BRIGHTNESS_MAX_PERCENT) level = BRIGHTNESS_MAX_PERCENT;
 
-    if(Mode == mode3 && choose_mode_falsg == 7U)
+    if(Mode == mode3 &&
+       (choose_mode_falsg == 7U || choose_mode_falsg == 8U))
         return brightness_scale_for_level(level);
 
     if(W_PWM != 0U && C_PWM != 0U)
@@ -381,7 +382,8 @@ void Light_Transition_Task(void)
     if(W_PWM != 0U && C_PWM != 0U &&
        !(Mode == mode1 &&
          (choose_mode_falsg == 5U || choose_mode_falsg == 6U)) &&
-       !(Mode == mode3 && choose_mode_falsg == 7U))
+       !(Mode == mode3 &&
+         (choose_mode_falsg == 7U || choose_mode_falsg == 8U)))
     {
         mix_total = (uint16_t)(W_PWM + C_PWM);
         weak_mix = (W_PWM < C_PWM) ? W_PWM : C_PWM;