diff --git a/app/src/main/java/com/casic/detector/base/BaseApplication.kt b/app/src/main/java/com/casic/detector/base/BaseApplication.kt
index 9c25ed1..e61ea61 100644
--- a/app/src/main/java/com/casic/detector/base/BaseApplication.kt
+++ b/app/src/main/java/com/casic/detector/base/BaseApplication.kt
@@ -55,5 +55,6 @@
         serialPorts.forEach {
             it.close()
         }
+        serialPorts.clear()
     }
 }
\ No newline at end of file

diff --git a/app/src/main/java/com/casic/detector/base/BaseApplication.kt b/app/src/main/java/com/casic/detector/base/BaseApplication.kt
index 9c25ed1..e61ea61 100644
--- a/app/src/main/java/com/casic/detector/base/BaseApplication.kt
+++ b/app/src/main/java/com/casic/detector/base/BaseApplication.kt
@@ -55,5 +55,6 @@
         serialPorts.forEach {
             it.close()
         }
+        serialPorts.clear()
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/casic/detector/base/SerialPortActivity.kt b/app/src/main/java/com/casic/detector/base/SerialPortActivity.kt
index a63bba9..eb84834 100644
--- a/app/src/main/java/com/casic/detector/base/SerialPortActivity.kt
+++ b/app/src/main/java/com/casic/detector/base/SerialPortActivity.kt
@@ -49,7 +49,7 @@
                     while (true) {
                         var size: Int
                         try {
-                            val buffer = ByteArray(32)
+                            val buffer = ByteArray(72)
                             if (inStream == null) return@launch
                             size = inStream!!.read(buffer)
                             if (size > 0) {
@@ -68,7 +68,7 @@
                     while (true) {
                         var size: Int
                         try {
-                            val buffer = ByteArray(32)
+                            val buffer = ByteArray(72)
                             if (inStream1 == null) return@launch
                             size = inStream1!!.read(buffer)
                             if (size > 0) {
@@ -87,7 +87,7 @@
                     while (true) {
                         var size: Int
                         try {
-                            val buffer = ByteArray(32)
+                            val buffer = ByteArray(72)
                             if (inStream2 == null) return@launch
                             size = inStream2!!.read(buffer)
                             if (size > 0) {
@@ -140,4 +140,9 @@
      * 串口读数
      * */
     abstract fun onDataReceived(buffer: ByteArray?, size: Int)
+
+    override fun onDestroy() {
+        BaseApplication.get().closeSerialPort()
+        super.onDestroy()
+    }
 }
\ No newline at end of file