diff --git a/examples/keyscan/keyscan_it/main.c b/examples/keyscan/keyscan_it/main.c
index 47d5e94e..f10e9313 100644
--- a/examples/keyscan/keyscan_it/main.c
+++ b/examples/keyscan/keyscan_it/main.c
@@ -42,7 +42,7 @@ int main(void)
     if (keyscan) {
         KEYSCAN_DEV(keyscan)->col_num = COL_NUM_4;
         KEYSCAN_DEV(keyscan)->row_num = ROW_NUM_4;
-        device_open(keyscan, 0); //current scan latency is 32K/1/8 = 4Khz
+        device_open(keyscan, 0); //current keyscan clock source:one is 32M/(31+1)/8 = 125Khz and another is 1MHZ
         device_set_callback(keyscan, keyscan_irq_callback);
         device_control(keyscan, DEVICE_CTRL_SET_INT, NULL);
         device_control(keyscan, DEVICE_CTRL_RESUME, NULL);
diff --git a/examples/keyscan/keyscan_it/readme.md b/examples/keyscan/keyscan_it/readme.md
index d07ad704..2d77a827 100644
--- a/examples/keyscan/keyscan_it/readme.md
+++ b/examples/keyscan/keyscan_it/readme.md
@@ -1,7 +1,7 @@
 **board/bl706_iot/clock_config.h** 中,
 
-**BSP_QDEC_KEYSCAN_CLOCK_SOURCE** 设置成 **ROOT_CLOCK_SOURCE_32K_CLK**
-**BSP_QDEC_KEYSCAN_CLOCK_DIV** 设置成 **0**
+**BSP_QDEC_KEYSCAN_CLOCK_SOURCE** 设置成 **ROOT_CLOCK_SOURCE_XCLK**
+**BSP_QDEC_KEYSCAN_CLOCK_DIV** 设置成 **31**
 
 **board/bl706_iot/pinmux_config.h** 中, 以下宏设置成 **GPIO_FUN_KEY_SCAN_ROW**
 
diff --git a/examples/keyscan/keyscan_poll/main.c b/examples/keyscan/keyscan_poll/main.c
index 10c83f39..a24241c8 100644
--- a/examples/keyscan/keyscan_poll/main.c
+++ b/examples/keyscan/keyscan_poll/main.c
@@ -33,7 +33,7 @@ int main(void)
     if (keyscan) {
         KEYSCAN_DEV(keyscan)->col_num = COL_NUM_4;
         KEYSCAN_DEV(keyscan)->row_num = ROW_NUM_4;
-        device_open(keyscan, 0); //current scan latency is 32K/1/8 = 4Khz
+        device_open(keyscan, 0); //current keyscan clock source:one is 32M/(31+1)/8 = 125Khz and another is 1MHZ
         device_control(keyscan, DEVICE_CTRL_RESUME, NULL);
         MSG("keyscan found\n");
     }
diff --git a/examples/keyscan/keyscan_poll/readme.md b/examples/keyscan/keyscan_poll/readme.md
index fb3677b9..918fd71c 100644
--- a/examples/keyscan/keyscan_poll/readme.md
+++ b/examples/keyscan/keyscan_poll/readme.md
@@ -1,7 +1,7 @@
 **board/bl706_iot/clock_config.h** 中,
 
-**BSP_QDEC_KEYSCAN_CLOCK_SOURCE** 设置成 **ROOT_CLOCK_SOURCE_32K_CLK**
-**BSP_QDEC_KEYSCAN_CLOCK_DIV** 设置成 **0**
+**BSP_QDEC_KEYSCAN_CLOCK_SOURCE** 设置成 **ROOT_CLOCK_SOURCE_XCLK**
+**BSP_QDEC_KEYSCAN_CLOCK_DIV** 设置成 **31**
 
 **board/bl706_iot/pinmux_config.h** 中, 以下宏设置成 **GPIO_FUN_KEY_SCAN_ROW**