diff --git a/docs/en/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst b/docs/en/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
index f07024ed1f..7a6a90e470 100644
--- a/docs/en/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
+++ b/docs/en/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
@@ -201,9 +201,9 @@ No.  Name  Type   Function
 17   IO33  I/O    GPIO33
 17   IO26  I/O    GPIO26
 18   IO21  I/O    GPIO21
-19   IO20  I/O    GPIO20, ADC2_CH3, USB_D+
-20   IO19  I/O    GPIO19, ADC2_CH3, USB_D-
-21   IO18  I/O    GPIO18, ADC2_CH3, DAC_2, RGB LED
+19   IO20  I/O    GPIO20, ADC2_CH9, USB_D+
+20   IO19  I/O    GPIO19, ADC2_CH8, USB_D-
+21   IO18  I/O    GPIO18, ADC2_CH7, DAC_2, RGB LED
 ===  ====  =====  ====================================
 
 .. [#] P: Power supply; I: Input; O: Output; T: High impedance. 
diff --git a/docs/zh_CN/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst b/docs/zh_CN/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
index 2964cbadd7..980ec4d77e 100644
--- a/docs/zh_CN/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
+++ b/docs/zh_CN/hw-reference/esp32s2/user-guide-saola-1-v1.2.rst
@@ -201,9 +201,9 @@ J3
 17    IO33  I/O    GPIO33
 17    IO26  I/O    GPIO26
 18    IO21  I/O    GPIO21
-19    IO20  I/O    GPIO20, ADC2_CH3, USB_D+
-20    IO19  I/O    GPIO19, ADC2_CH3, USB_D-
-21    IO18  I/O    GPIO18, ADC2_CH3, DAC_2, RGB LED
+19    IO20  I/O    GPIO20, ADC2_CH9, USB_D+
+20    IO19  I/O    GPIO19, ADC2_CH8, USB_D-
+21    IO18  I/O    GPIO18, ADC2_CH7, DAC_2, RGB LED
 ====  ====  =====  ====================================
 
 .. [#] P：电源；I：输入；O：输出；T：可设置为高阻。