diff --git a/docs/zh_CN/api.md b/docs/zh_CN/api.md
index 5214aa82..d61e3f0f 100644
--- a/docs/zh_CN/api.md
+++ b/docs/zh_CN/api.md
@@ -1,8 +1,9 @@
-# API参考
+# API参考 {docsify-ignore-all}
 
 |||
 |:---:|:---:|
 |**[LCD](zh_CN/api/lcd)** | **[Speaker](zh_CN/api/speaker)** |
+|**[Button](zh_CN/api/button)** | **[MPU9250](zh_CN/api/mpu9250)** |
 
 <!-- |[BUTTON](zh_CN/api_reference/micropython/api_lcd) | [BUTTON](zh_CN/api_reference/arduino/api_lcd) |
 |[SPEAKER](zh_CN/api_reference/micropython/api_lcd) | [SPEAKER](zh_CN/api_reference/arduino/api_lcd) | -->
diff --git a/docs/zh_CN/api/button.md b/docs/zh_CN/api/button.md
new file mode 100644
index 00000000..ea94577e
--- /dev/null
+++ b/docs/zh_CN/api/button.md
@@ -0,0 +1,102 @@
+# 按键
+
+### isPressed()
+
+**函数原型：**
+
+<mark>isPressed();</mark> // for arduino
+
+<!-- <mark>fillScreen(color)</mark> # for micropython -->
+
+**功能：返回键值。如果指定按键奇数次数按下后，一直返回 1，偶数次数按下，一直返回 0。**
+
+**例程**
+```arduino
+#include <M5Stack.h>
+
+void setup(){
+    M5.begin();
+}
+
+void loop(){
+    if(M5.BtnA.isPressed()) { // for button A
+        Serial.printf("A\r\n");
+    }
+    M5.update();
+}
+```
+
+### wasPressed()
+
+**函数原型：**
+
+<mark>wasPressed();</mark> // for arduino
+
+<!-- <mark>fillScreen(color)</mark> # for micropython -->
+
+**功能：返回键值。如果指定按键按下，则返回 1 一次，然后置位为0，否则一直返回 0。**
+
+**例程**
+```arduino
+#include <M5Stack.h>
+
+void setup(){
+    M5.begin();
+}
+
+void loop(){
+    if(M5.BtnA.wasPressed()) { // for button A
+        M5.Lcd.printf("A");
+        Serial.printf("A");
+    }
+    M5.update();
+}
+```
+<!-- ```python
+# MicroPython
+from m5stack import *
+from m5ui import *
+
+lcd.fillScreen(lcd.RED)
+``` -->
+
+* * *
+
+### pressedFor()
+
+**函数原型：**
+
+<mark>pressedFor(uint32_t ms);</mark> // for arduino
+
+<!-- <mark>fillScreen(color)</mark> # for micropython -->
+
+**功能：返回键值。如果指定按键按下超过指定时间之后，则返回 1，否则返回 0。**
+
+| 参数 | 描述 |
+| --- | --- |
+| ms | 按键按下时间 (单位：毫秒) |
+
+**例程**
+```arduino
+#include <M5Stack.h>
+
+void setup(){
+    M5.begin();
+}
+
+void loop(){
+    if(M5.BtnA.pressedFor(2000)) { // for button A
+        Serial.printf("A");
+    }
+    M5.update();
+}
+```
+<!-- ```python
+# MicroPython
+from m5stack import *
+from m5ui import *
+
+lcd.fillScreen(lcd.RED)
+``` -->
+
+<!-- * * * -->
\ No newline at end of file
diff --git a/docs/zh_CN/api/gpio.md b/docs/zh_CN/api/gpio.md
deleted file mode 100644
index 879a7088..00000000
--- a/docs/zh_CN/api/gpio.md
+++ /dev/null
@@ -1,21 +0,0 @@
-# GPIO {docsify-ignore-all}
-
-*使用Arduino库的GPIO API*
-
-### <mark>digitalRead</mark>
-> uint32 digitalRead(uint8 pin);
-
-读取数字引脚电平值
-
-| Param | Type | Description |
-| --- | --- | --- |
-| pin | <code>uint8</code> | 引脚编号 |
-
-Return:
-    电平值(0/1)
-
-**例程**
-```arduino
-uint32_t pin21_data;
-pin21_data = digitalRead(21);
-```
\ No newline at end of file
diff --git a/docs/zh_CN/api/speaker.md b/docs/zh_CN/api/speaker.md
index 17467053..171eb32a 100644
--- a/docs/zh_CN/api/speaker.md
+++ b/docs/zh_CN/api/speaker.md
@@ -1,4 +1,4 @@
-# Speaker
+# 喇叭
 
 ### <mark>tone</mark>
 > M5.Speaker.tone(uint32_t freq);
@@ -12,4 +12,37 @@
 **例程**
 ```arduino
 M5.Speaker.tone(100);
-```
\ No newline at end of file
+```
+
+### tone()
+
+**函数原型：**
+
+<mark>tone(uint16_t freq);</mark> // for arduino
+<mark>tone(uint16_t freq, uint32_t duration);</mark> // for arduino
+<!-- <mark>fillScreen(color)</mark> # for micropython -->
+
+**功能：喇叭响指定频率的声音持续指定时间。**
+
+| 参数 | 描述 |
+| --- | --- |
+| freq | 声音频率 |
+| duration | 持续时间 (单位：毫秒) |
+
+*如果函数的 duration 值没给出，则使用当前的背景颜色。*
+
+**例程**
+```arduino
+#include <M5Stack.h>
+
+M5.begin();
+
+M5.Speaker.tone(900, 1000);
+```
+<!-- ```python
+# MicroPython
+from m5stack import *
+from m5ui import *
+
+lcd.fillScreen(lcd.RED)
+``` -->
\ No newline at end of file