diff --git a/communication/build.gradle b/communication/build.gradle
index ccf0e6c9..da91f7e9 100644
--- a/communication/build.gradle
+++ b/communication/build.gradle
@@ -47,4 +47,5 @@ dependencies {
     api project(path: ':mifaretag')
 
     implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.github.felHR85:UsbSerial:6.1.0'
 }
diff --git a/communication/libs/usbserial.jar b/communication/libs/usbserial.jar
deleted file mode 100644
index 968e3ad1..00000000
Binary files a/communication/libs/usbserial.jar and /dev/null differ
diff --git a/communication/src/main/java/cn/dxl/com/Com.java b/communication/src/main/java/cn/dxl/com/Com.java
index 7fa4425f..77331faf 100644
--- a/communication/src/main/java/cn/dxl/com/Com.java
+++ b/communication/src/main/java/cn/dxl/com/Com.java
@@ -19,7 +19,7 @@ public final class Com implements Serializable {
      * For standardization and security,
      * you should not change any functions and variables defined by the native keyword,
      * or you may have a big problem!
-     * If your implementation does not need to be mapped to the bottom (only Java exists), please do not use this tool class!
+     * If your implementation does not need to be mapped to the c/c++ (only Java exists), please do not use this tool class!
      *
      * 警告!!!
      * 为了规范性和安全性，你不应当更改任何native关键字定义的函数与变量，否则可能会出现大问题！
diff --git a/communication/src/main/java/cn/rrg/com/UsbSerialControl.java b/communication/src/main/java/cn/rrg/com/UsbSerialControl.java
index 7d4736e4..b8cae7c2 100644
--- a/communication/src/main/java/cn/rrg/com/UsbSerialControl.java
+++ b/communication/src/main/java/cn/rrg/com/UsbSerialControl.java
@@ -22,7 +22,6 @@ import java.util.List;
 import java.util.Queue;
 
 import cn.dxl.common.util.AppUtil;
-import cn.dxl.common.util.HexUtil;
 
 /*
  * Usb 2 uart Serial implements
diff --git a/io_redirect/build.gradle b/io_redirect/build.gradle
index c1f02ad7..f55ac1a7 100644
--- a/io_redirect/build.gradle
+++ b/io_redirect/build.gradle
@@ -41,4 +41,4 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'androidx.appcompat:appcompat:1.1.0'
-}
+}
\ No newline at end of file