diff --git a/docs/assets/css/main.css b/docs/assets/css/main.css
index 91e24eed..ba71934d 100644
--- a/docs/assets/css/main.css
+++ b/docs/assets/css/main.css
@@ -206,7 +206,8 @@ body[data-page="ja/README.md"] #faces-kit {
 #core-bottom,
 #m5go-bottom,
 #m5go-rfid,
-#m5go-charger {
+#m5go-charger,
+#pm2_5 {
     width: 0;
     height: 0;
     overflow: hidden;
@@ -289,7 +290,7 @@ body[data-page="ja/README.md"] #application {
 #lidarbot,
 #piano,
 #flir,
-#M5IoT-kit {
+#m5iot-kit {
     width: 0;
     height: 0;
     overflow: hidden;
diff --git a/docs/assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-01.jpg b/docs/assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-01.jpg
new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/docs/assets/img/product_pics/base/PM2.5/PM2.5-1.jpg b/docs/assets/img/product_pics/base/PM2.5/PM2.5-1.jpg
new file mode 100644
index 00000000..f74c2e30
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diff --git a/docs/assets/img/product_pics/base/PM2.5/PM2.5-2.jpg b/docs/assets/img/product_pics/base/PM2.5/PM2.5-2.jpg
new file mode 100644
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diff --git a/docs/assets/img/product_pics/base/PM2.5/PM2.5-3.jpg b/docs/assets/img/product_pics/base/PM2.5/PM2.5-3.jpg
new file mode 100644
index 00000000..fd0969e5
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diff --git a/docs/assets/img/product_pics/base/PM2.5/PM2.5-4.jpg b/docs/assets/img/product_pics/base/PM2.5/PM2.5-4.jpg
new file mode 100644
index 00000000..b0a5cd00
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diff --git a/docs/zh_CN/README.md b/docs/zh_CN/README.md
index 5c2b7442..23a09059 100644
--- a/docs/zh_CN/README.md
+++ b/docs/zh_CN/README.md
@@ -256,6 +256,7 @@
 ## Core BOTTOM
 ## M5GO BOTTOM
 
+
 <div class="item">
   <a href="/#/zh_CN/base/lan_base">
     <img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/m5-docs_homepage/base/base_lan_01.png">
@@ -300,6 +301,7 @@
 
 ## M5GO RFID
 ## M5GO CHARGER
+## pm2_5
 
 <div class="item">
   <a href="/#/zh_CN/base/m5go_rfid">
@@ -315,6 +317,13 @@
   <p class="item-title" style="font-style:italic;">M5GO CHARGER</p>
 </div>
 
+<div class="item">
+  <a href="/#/zh_CN/base/PM2.5">
+    <img src="assets/img/product_pics/base/PM2.5/PM2.5-1.jpg">
+  </a>
+  <p class="item-title" style="font-style:italic;">PM2.5</p>
+</div>
+
 ***
 
 # Unit
@@ -704,12 +713,11 @@
 
 <!-- <div class="item">
   <a href="/#/zh_CN/app/M5IoT-kit">
-    <img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/m5-docs_homepage/app/app_flir_01.png">
+    <img src="assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-01.jpg">
   </a>
   <p class="item-title" style="font-style:italic;">M5IoT-kit</p>
-</div>
+</div> -->
 
-here -->
 
 ***
 
diff --git a/docs/zh_CN/app/M5IoT-kit.md b/docs/zh_CN/app/M5IoT-kit.md
index d5ad0f3a..3ebf0399 100644
--- a/docs/zh_CN/app/M5IoT-kit.md
+++ b/docs/zh_CN/app/M5IoT-kit.md
@@ -1,6 +1,6 @@
-# Application M5IoT-kit {docsify-ignore-all}
+# M5IoT-kit {docsify-ignore-all}
 
-<img src="assets/img/product_pics/app/bala_1.jpg" width="250" height="250"> <img src="assets/img/product_pics/app/bala_5.jpg" width="250" height="250">
+<img src="assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-01.jpg" width="250" height="250"> <img src="assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-02.jpg" width="250" height="250"><img src="assets/img/product_pics/app/M5IoT-kit/M5IoT-kit-03.jpg" width="250" height="250">
 
 * * *
 
diff --git a/docs/zh_CN/base/PM2.5.md b/docs/zh_CN/base/PM2.5.md
new file mode 100644
index 00000000..f68cfe3f
--- /dev/null
+++ b/docs/zh_CN/base/PM2.5.md
@@ -0,0 +1,61 @@
+# PM2.5 {docsify-ignore-all}
+
+<img src="assets/img/product_pics/base/PM2.5/PM2.5-3.jpg" width="250" height="250"> <img src="assets/img/product_pics/base/PM2.5/PM2.5-2.jpg" width="250" height="250"><img src="assets/img/product_pics/base/PM2.5/PM2.5-4.jpg" width="250" height="250">
+
+* * *
+
+:memo:**[描述](#描述)**&nbsp;&nbsp;&nbsp;:bulb:**[上手指南](/zh_CN/quick_start/m5core/m5stack_core_quick_start)**&nbsp;&nbsp;&nbsp;:octocat:**[例程](#案例)**&nbsp;&nbsp;&nbsp;🛒**[购买链接](https://item.taobao.com/item.htm?spm=a2oq0.12575281.0.0.78ec1debCSGLNF&ft=t&id=594362860431)**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:clapper:**[相关视频](#相关视频)**
+
+
+## 描述
+
+**PM2.5** 是一款环境温湿度、空气质量检测产品.内置SHT20温湿度传感器、PMSA003数字式通用颗粒物浓度传感器.能够快速检测当前环境的温湿度数据，并采集计算单位体积内空气中不同粒径的悬浮颗粒物个数.能够应用在生活或是工业等场景中，用作环境数据采集，或为空气中悬浮颗粒物浓度相关的仪器仪表或环境改善设备，提供实时准确的浓度数据.
+
+
+## 产品特性
+
+-  激光散射原理实现精准测量
+-  零错误报警率
+-  实时响应并支持连续采集
+-  最小分辨粒径 0.3μ m
+-  六面全方位屏蔽，抗干扰性能更强
+-  进出风口方向可选，适用范围广，用户无需再进行风道设计
+
+## 模块参数
+
+
+| **参数** | **指标**  |**单位** |
+| :------: | :------: | :------: |
+| 颗粒物测量范围 | 0.3~1.0；1.0~2.5；2.5~10  | 微米（μ m）|
+| 颗粒物计数效率 | 50%@0.3 ；98%@>=0.5   | 微米（μ m）|
+| 颗粒物质量浓度有效量程（PM2.5 标准值） | 0~500 | 微克/立方米 |
+| 颗粒物质量浓度最大量程（PM2.5 标准值） | ≥1000 | 微克/立方米 |
+| 颗粒物质量浓度分辨率 | 1 | 微克/立方米 |
+| 颗粒物质量浓度一致性（PM2.5 标准值）| ±10%@100~500 ；±10@0~100 | 微克/立方米 |
+| 称准体积 | 0.1  | 升（L）|
+| 单次响应时间 | ＜1 | 秒（s）|
+| 综合响应时间 | ≤10  | 秒（s） |
+| 直流供电电压  | Typ:5.0  Min:4.5  Max: 5.5 | 伏特（V）|
+| 工作电流 | ≤100 | 毫安（mA）|
+| 待机电流 | ≤200 | 微安（μ A）|
+| 数据接口电平 | L <0.8 @3.3 H >2.7@3.3 | 伏特（V）|
+| 工作温度范围 | -10~+60 | 摄氏度（℃）|
+| 工作湿度范围 | 0~99% | |
+| 储存温度范围 | -40~+80 | 摄氏度（℃）|
+
+[点击此处查看配套M5Core参数](/zh_CN/core/basic)
+
+## 套件清单
+
+- 1x BASIC Controller
+- 1x PM2.5 sensor
+- 1x Type-C USB
+- 2x M3x16 螺丝
+
+## 参考文档
+
+**数据手册**
+
+- [SHT20](https://pdf1.alldatasheet.com/datasheet-pdf/view/756285/ETC2/SHT20.html)
+
+- [PMSA003](https://datasheet.lcsc.com/szlcsc/Beijing-Plantower-PMSA003-C_C89095.pdf)
diff --git a/docs/zh_CN/base/btc_base.md b/docs/zh_CN/base/btc_base.md
index 1aa545ce..479ce255 100644
--- a/docs/zh_CN/base/btc_base.md
+++ b/docs/zh_CN/base/btc_base.md
@@ -23,7 +23,7 @@
 
 -  内置DHT12
 
-#  包含
+#  套件清单
 
 -  Type-C USB
 -  2x M3x16螺丝
diff --git a/docs/zh_CN/core/gray.md b/docs/zh_CN/core/gray.md
index 73ed1698..932c31de 100644
--- a/docs/zh_CN/core/gray.md
+++ b/docs/zh_CN/core/gray.md
@@ -28,7 +28,7 @@
 - 5V 直流电源
 - USB Type-C
 - 基于ESP32开发
-- 16 MByte PSRAM
+- 16 MByte flash
 - MPU9250
 - 扬声器，按键x3，LCD屏幕（320 * 240），电源/复位按键x1
 - 2.4G天线：Proant 440
@@ -105,7 +105,7 @@
    </tr>
    <tr>
       <td>ESP32</td>
-      <td>240MHz dual core, 600 DMIPS, 520KB SRAM, Wi-Fi, dual mode Bluetooth</td>
+      <td>240MHz 双核, 600 DMIPS, 520KB SRAM, Wi-Fi, 双模蓝牙</td>
    </tr>
    <tr>
       <td>Flash闪存</td>
@@ -143,10 +143,6 @@
       <td>外壳材质</td>
       <td>Plastic ( PC )</td>
    </tr>
-   <tr>
-      <td>重量</td>
-      <td>120g with bottom, 100g only core</td>
-   </tr>
 </table>
 
 **<mark>注意：</mark>**