diff --git a/src/Transmit.cpp b/src/Transmit.cpp
index 581c2ac..393aa82 100644
--- a/src/Transmit.cpp
+++ b/src/Transmit.cpp
@@ -18,7 +18,7 @@ namespace Transmission {
 
     }
 
-    void Transmit::dataArrives(unsigned char *data, size_t size) {
+    void Transmit::dataArrives(const unsigned char *data, size_t size) {
         std::unique_lock<std::mutex> lock(dataMutex);
         charBuff.put(data, 0, size);
         if (this->packSize < 0) {
@@ -118,10 +118,10 @@ namespace Transmission {
         return ptr;
     }
 
-    void Transmit::sendData(unsigned char *data, size_t size, int type) {
+    void Transmit::sendData(const unsigned char *data, size_t size, int type) {
         DataPackets dataPackets;
         dataPackets.set_type(type);
-        std::string byteData(reinterpret_cast<char *>(data), size);
+        std::string byteData(reinterpret_cast<const char *>(data), size);
         dataPackets.set_data(byteData);
         if (size < 64) {
             //小于64字节的数据包不压缩
@@ -132,7 +132,7 @@ namespace Transmission {
         }
     }
 
-    void Transmit::pushData(unsigned char *data, int32_t size) const {
+    void Transmit::pushData(const unsigned char *data, int32_t size) const {
         ::send(this->fd, (const char *) &size, sizeof(int32_t), 0);
         ::send(this->fd, (const char *) data, size, 0);
         ::send(this->fd, (const char *) &DATA_STOP, sizeof(DATA_STOP), 0);
diff --git a/src/Transmit.h b/src/Transmit.h
index 0e04930..55badbe 100644
--- a/src/Transmit.h
+++ b/src/Transmit.h
@@ -44,7 +44,7 @@ namespace Transmission {
         void pushLzmaData(DataPackets &data);
 
         /// 实际发送
-        virtual void pushData(unsigned char *data, int32_t size) const;
+        virtual void pushData(const unsigned char *data, int32_t size) const;
 
     protected:
 
@@ -59,10 +59,10 @@ namespace Transmission {
         explicit Transmit(SOCKET fd, std::string ip);
 
         /// 收到来自网络的数据
-        virtual void dataArrives(unsigned char *data, size_t size);
+        virtual void dataArrives(const unsigned char *data, size_t size);
 
         /// 发送数据
-        virtual void sendData(unsigned char *data, size_t size, int type);
+        virtual void sendData(const unsigned char *data, size_t size, int type);
 
         /// 数据包就绪
         /// @param type 数据包类型
diff --git a/test/test_main.cpp b/test/test_main.cpp
index 20f2540..4511dc6 100644
--- a/test/test_main.cpp
+++ b/test/test_main.cpp
@@ -39,7 +39,7 @@ public:
         isExec = true;
     }
 
-    void pushData(unsigned char *data, int32_t size) const override {
+    void pushData(const unsigned char *data, int32_t size) const override {
         ::write(this->fd, &size, sizeof(int32_t));
         ::write(this->fd, data, size);
         ::write(this->fd, &DATA_STOP, sizeof(DATA_STOP));