diff --git a/docs/en/api_reference.md b/docs/en/api_reference.md
index 90118c72..a63cf29a 100644
--- a/docs/en/api_reference.md
+++ b/docs/en/api_reference.md
@@ -1,6 +1,6 @@
 # API Reference
 
-[中文](/zh_CN/api_reference) | English | [日本語](/ja/api_reference)
+[中文](zh_CN/api_reference) | English | [日本語](ja/api_reference)
 
 | MicroPython | Arduino |
 |:------------|:--------|
diff --git a/docs/en/file_to_display_null.md b/docs/en/file_to_display_null.md
deleted file mode 100644
index 266736c3..00000000
--- a/docs/en/file_to_display_null.md
+++ /dev/null
@@ -1 +0,0 @@
-### Coming soon...
diff --git a/docs/en/product_documents/units/unit_esp32cam.md b/docs/en/product_documents/units/unit_esp32cam.md
index 6270a6d0..d0b810bd 100644
--- a/docs/en/product_documents/units/unit_esp32cam.md
+++ b/docs/en/product_documents/units/unit_esp32cam.md
@@ -4,9 +4,9 @@
 
 ## DESCRIPTION
 
-The **<mark>ESP32Cam</mark>** is a tiny unit based on ESP32 chip and OV2640. You can even program it through Arduino IDE.
+The **<mark>ESP32Cam</mark>** is a tiny unit based on ESP32 chip and OV2640. You can even program it through ESP-IDF.
 
-The ESP32Cam equips the ESP32 with everything necessary to program, run and develop on the wonderful chip. It also features a LiPo charger , so your ESP32Cam project can be battery-powered and truly wireless. Additionally, the board reserved the MPU6050,BME280 and an analog MIC.
+The ESP32Cam equips the ESP32 with everything necessary to program, run and develop on the wonderful chip. It also features a LiPo charger , so your ESP32Cam project can be battery-powered and truly wireless. Additionally, the board reserved the Welding positions of MPU6050,BME280 and an analog MIC.
 
 
 ## INCLUDES
@@ -51,6 +51,8 @@ The ESP32Cam equips the ESP32 with everything necessary to program, run and deve
 - **[Example](https://github.com/m5stack/esp32-cam-demo/tree/m5cam) (ESP32)**
 - **[Datasheet](https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_cn.pdf) (ESP32)**
 - **[Datasheet](https://www.uctronics.com/download/cam_module/OV2640DS.pdf) (OV2640)**
+- **[PinMap](https://github.com/m5stack/M5-Schematic/blob/master/Units/esp32-cam/hardware_diff_with_ESP32CAM_M5Camera.md)**
+- **[Schematic](https://github.com/m5stack/M5-Schematic/blob/master/Units/esp32-cam/M5CAM-ESP32-A1-POWER.pdf)**
 - **[Quick Start](/en/quick_start/m5camera/m5camera_quick_start)**
 - [ESP32Cam purchase (AliExpress)](https://www.aliexpress.com/store/product/M5Stack-Official-ESP32-Camera-Module-Development-Board-OV2640-Camera-Type-C-Grove-Port-3D-Wifi-Antenna/3226069_32881414545.html)
 
diff --git a/docs/en/product_documents/units/unit_m5camera.md b/docs/en/product_documents/units/unit_m5camera.md
index bddeb721..78f9b8f9 100644
--- a/docs/en/product_documents/units/unit_m5camera.md
+++ b/docs/en/product_documents/units/unit_m5camera.md
@@ -4,9 +4,9 @@
 
 ## DESCRIPTION
 
-The **<mark>M5Camera</mark>** is a tiny unit based on ESP32 chip and OV2640 <mark>including PSRAM</mark>. You can even program it through Arduino IDE.
+The **<mark>M5Camera</mark>** is a tiny unit based on ESP32 chip and OV2640 <mark>including PSRAM</mark>. You can even program it through ESP-IDF.
 
-The M5Camera equips the ESP32 with everything necessary to program, run and develop on the wonderful chip. It also features a LiPo charger (IP5306) , so your M5Camera project can be battery-powered and truly wireless. Additionally, the board reserved the MPU6050,BME280 and an analog MIC.
+The M5Camera equips the ESP32 with everything necessary to program, run and develop on the wonderful chip. It also features a LiPo charger (IP5306) , so your M5Camera project can be battery-powered and truly wireless. Additionally, the board reserved the Welding positions of MPU6050,BME280 and an analog MIC.
 
 
 ## INCLUDES
@@ -50,6 +50,7 @@ The M5Camera equips the ESP32 with everything necessary to program, run and deve
 - **[Example](https://github.com/m5stack/esp32-cam-demo/tree/m5cam-psram) (ESP32)**
 - **[Datasheet](https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_cn.pdf) (ESP32)**
 - **[Datasheet](https://www.uctronics.com/download/cam_module/OV2640DS.pdf) (OV2640)**
+- **[PinMap](https://github.com/m5stack/M5-Schematic/blob/master/Units/m5camera/hardware_diff_with_ESP32CAM_M5Camera.md)**
 - **[Quick Start](/en/quick_start/m5camera/m5camera_quick_start)**
 
 <figure>
diff --git a/docs/en/quick_start.md b/docs/en/quick_start.md
index 1f91a9a6..2eb2e595 100644
--- a/docs/en/quick_start.md
+++ b/docs/en/quick_start.md
@@ -4,10 +4,9 @@
 
 *This document is intended to help you set up the software environment(<mark>Arudino</mark>, <mark>MicroPython</mark>) for development of M5Stack. Through a simple example we would like to illustrate how to develop M5Stack boards, firmware(<mark>Arduino</mark>) or source files(<mark>MicroPython</mark>) download to M5Stack boards.*
 
-<img src="assets/img/getting_started_pics/m5stack_core.png"> | <img src="assets/img/getting_started_pics/m5camera.jpg">  | <img src="assets/img/getting_started_pics/M5Bala.jpg">
----|---|---
+<img src="assets/img/getting_started_pics/m5stack_core.png"> | <img src="assets/img/getting_started_pics/m5camera.jpg">
+---|---
 [M5StackCore](/en/quick_start/m5core/m5stack_core_quick_start) | [M5Camera](/en/quick_start/m5camera/m5camera_quick_start)
- <!-- | [M5BALA](/en/quick_start/bala/bala_quick_start) -->
 
 <!-- ## Practice
 
diff --git a/docs/zh_CN/api_reference.md b/docs/zh_CN/api_reference.md
index 9885e318..127fb466 100644
--- a/docs/zh_CN/api_reference.md
+++ b/docs/zh_CN/api_reference.md
@@ -1,14 +1,13 @@
 # API Reference
 
-中文  | [English](/en/api_reference) | [日本語](/ja/api_reference)
-
-*这是MicroPython的编程API*
-
+中文  | [English](en/api_reference) | [日本語](ja/api_reference)
 
 | MicroPython | Arduino |
 |:------------|:--------|
-|[LCD](zh_CN/api_reference/micropython/api_lcd) | / |
+|[LCD](zh_CN/api_reference/micropython/api_lcd) | [LCD](zh_CN/api_reference/arduino/api_lcd) |
 
+<!-- |[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) | -->
 
 <!-- ## [LCD](zh_CN/api_reference/micropython/api_lcd) -->
 <!-- ## [Peripherals](zh_CN/api_reference/peripherals/api_gpio)
diff --git a/docs/zh_CN/api_reference/arduino/api_lcd.md b/docs/zh_CN/api_reference/arduino/api_lcd.md
new file mode 100644
index 00000000..d90fb57c
--- /dev/null
+++ b/docs/zh_CN/api_reference/arduino/api_lcd.md
@@ -0,0 +1,202 @@
+# LCD
+
+<!-- 中文 | [English](/en/api_reference/micropython/api_lcd) | [日本語](/ja/api_reference/micropython/api_lcd) -->
+
+*屏幕像素为320x240，以屏幕左上角为原点(0,0)*
+
+### <mark>M5.lcd.setBrightness(uint8_t brightness);</mark>
+
+**例程**
+```c++
+M5.lcd.setBrightness(200);
+```
+
+**设置整个屏幕显示的亮度。**
+
+| 参数 | 描述 |
+| --- | --- |
+| brightness | 屏幕的亮度(0-254) |
+
+* * *
+
+### <mark>M5.Lcd.setCursor(uint16_t x0, uint16_t y0);</mark>
+
+**例程**
+```c++
+M5.lcd.setCursor(20, 40);
+```
+
+**设置下一次要显示的起始位置(x0, y0)**
+
+* * *
+
+### <mark>M5.Lcd.fillScreen(uint16_t color);</mark>
+**例程**
+```c++
+M5.Lcd.fillScreen(BLUE)
+```
+**以指定的颜色填充整个屏幕。**
+
+| 参数 | 描述 |
+| --- | --- |
+| color | 颜色值 |
+
+
+
+* * *
+
+<!--
+### <mark>lcd.drawPixel(x, y [,color])</mark>
+**例程**
+```python
+lcd.drawPixel(22,22,lcd.RED)
+```
+**在位置(x,y)处画点。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| color | 颜色值 |
+
+
+
+* * *
+
+### <mark>lcd.drawLine(x, y, x1, y1 [,color])</mark>
+**例程**
+```python
+lcd.drawLine(0,0,12,12,lcd.WHITE)
+```
+**以指定的颜色从点(x,y)到点(x1,y1)画直线。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| color | 颜色值 |
+
+
+* * *
+
+### <mark>lcd.drawTriangle(x, y, x1, y1, x2, y2 [,color])</mark>
+
+**例程**
+```python
+lcd.drawTriangle(22,22,69,98,51,22,lcd.RED)
+```
+
+**以指定颜色画三角形，顶点分别为(x,y)，(x1,y1)和(x2,y2)。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| color | 颜色值 |
+
+* * *
+
+### <mark>lcd.fillTriangle(x, y, x1, y1, x2, y2 [,color])</mark>
+
+**例程**
+```python
+lcd.fillTriangle(122, 122, 169, 198, 151, 182, lcd.RED)
+```
+**以指定颜色画<mark>填充形式</mark>的三角形，顶点分别为(x,y)，(x1,y1)和(x2,y2)。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| color | 颜色值 |
+
+
+* * *
+### <mark>lcd.drawRect(x, y, w, h, [,color])</mark>
+**例程**
+```python
+lcd.drawRect(180, 12, 122, 10, lcd.BLUE)
+```
+**以指定颜色画矩形，其中矩形左上角坐标为(x,y)，宽高分别为width和height。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| w | 图形宽(单位: 像素) |
+| h | 图形高(单位: 像素) |
+| color | 颜色值 |
+
+
+
+
+* * *
+
+### <mark>lcd.drawRoundRect(x, y, w, h, r [,color])</mark>
+**例程**
+```python
+lcd.fillRoundRect(180,70,122,10,4,lcd.BLUE)
+```
+**以指定颜色画<mark>圆角</mark>矩形，其中矩形左上角坐标为(x,y)，宽高分别为width和height，圆角半径为r。**
+
+*如果函数的color值没给出，则使用当前的背景颜色。*
+
+| 参数 | 描述 |
+| --- | --- |
+| w | 图形宽(单位: 像素) |
+| h | 图形高(单位: 像素) |
+| r | 圆角半径 |
+| color | 颜色值 |
+
+
+
+
+* * *
+### <mark>lcd.print(‘text’, [x, y])</mark>
+**例程**
+```python
+lcd.print('this is a print text function', 80, 80)
+```
+**在(x,y)处开始打印文本(字符串)text。**
+
+| 参数 | 描述 |
+| --- | --- |
+| text | 要打印的内容 |
+
+
+* * *
+
+### <mark>lcd.clear([color])</mark>
+
+**例程**
+```python
+lcd.clear()
+```
+
+**清屏(即以当前的背景颜色填充整个屏幕)。**
+
+
+* * *
+
+### Usage
+
+```python
+from machine import SPI, Pin
+from display import LCD
+
+spi = SPI(1, baudrate=32000000, mosi=Pin(23), miso=Pin(19), sck=Pin(18))
+
+lcd = LCD(spi = spi) #lcd init
+lcd.fillScreen(lcd.BLACK) #set the default background color
+
+lcd.drawLine(0, 0, lcd.WHITE)
+lcd.drawTriangle(22, 22, 69, 98, 51, 22, lcd.RED)
+lcd.fillTriangle(122, 122, 169, 198, 151, 182, lcd.RED)
+lcd.drawCircle(180, 180, 10, lcd.BLUE)
+lcd.fillcircle(100, 100, 10, lcd.BLUE)
+lcd.drawRect(180, 12, 122, 10, lcd.BLUE)
+lcd.fillRect(180, 30, 122, 10, lcd.BLUE)
+lcd.drawRoundRect(180, 50, 122, 10, 4, lcd.BLUE)
+lcd.fillRoundRect(180, 70, 122, 10, 4, lcd.BLUE)
+lcd.print('this is a print text function', 80, 80)
+``` -->
diff --git a/docs/zh_CN/api_reference/micropython/api_lcd.md b/docs/zh_CN/api_reference/micropython/api_lcd.md
index 36187ec6..e0fc0a08 100644
--- a/docs/zh_CN/api_reference/micropython/api_lcd.md
+++ b/docs/zh_CN/api_reference/micropython/api_lcd.md
@@ -2,6 +2,8 @@
 
 中文 | [English](/en/api_reference/micropython/api_lcd) | [日本語](/ja/api_reference/micropython/api_lcd)
 
+*屏幕像素为320x240，以屏幕左上角为原点(0,0)*
+
 ### <mark>lcd.setRotation(degree)</mark>
 
 **例程**
@@ -163,7 +165,7 @@ lcd.fillRoundRect(180,70,122,10,4,lcd.BLUE)
 lcd.print('this is a print text function', 80, 80)
 ```
 **在(x,y)处开始打印文本(字符串)text。**
-    
+
 | 参数 | 描述 |
 | --- | --- |
 | text | 要打印的内容 |
diff --git a/docs/zh_CN/file_to_display_null.md b/docs/zh_CN/file_to_display_null.md
deleted file mode 100644
index 6b8ddcbd..00000000
--- a/docs/zh_CN/file_to_display_null.md
+++ /dev/null
@@ -1,3 +0,0 @@
-### 在编辑中...
-
-### 敬请期待...
\ No newline at end of file