diff --git a/libserial/serial.cpp b/libserial/serial.cpp
index a78d161..bcfcedc 100644
--- a/libserial/serial.cpp
+++ b/libserial/serial.cpp
@@ -50,12 +50,19 @@ public:
         }
     }
 
-    void write(const char* data, int len) 
+    int write(const char* data, int len)
     {
+        bytes_transferred_ = 0;
+        io_.reset();
 
+        boost::system::error_code write_ec;
+
+        std::size_t ret = boost::asio::write(*port_, boost::asio::buffer(data, len), write_ec);
+        int send_size = static_cast<int>(ret);
+        return send_size;
     }
 
-    int  read(char* data, int size)
+    int read(char* data, int size)
     {
         bytes_transferred_ = 0;
         io_.reset();
@@ -235,9 +242,9 @@ int CSerialOpr::read(char* data, int size)
 {
     return imp_->read(data, size);
 }
-int CSerialOpr::write(const char* data)
+int CSerialOpr::write(const char* data, int len)
 {
-    return 0;
+    return imp_->write(data, len);
 }
 const char* CSerialOpr::get_last_error() const
 {
diff --git a/libserial/serial.h b/libserial/serial.h
index e6fd3a6..710fd6f 100644
--- a/libserial/serial.h
+++ b/libserial/serial.h
@@ -55,7 +55,7 @@ public:
     int  open();
     void close();
     int  read(char* data, int size);
-    int  write(const char* data);
+    int  write(const char* data, int len);
     const char* get_last_error() const;
 
 private:
diff --git a/main.cpp b/main.cpp
index 25d64b8..f9b8d6c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,6 +6,8 @@ using namespace cppbox;
 int main()
 {
     char buffer[512]{};
+    char buffer2[512]{};
+    std::snprintf(buffer2, sizeof(buffer2), "%s", "Hello/000\r\n");
     
     CSerialOpr opr;
 
@@ -14,7 +16,7 @@ int main()
     opr.set_flow_control(FlowControl::NoFlowControl);
     opr.set_parity(Parity::EvenParity);
     opr.set_port("COM2");
-    opr.set_timeout(10 * 1000);
+    opr.set_timeout(100 * 1000);
     opr.set_stop_bits(StopBits::OneStop);
 
     if (opr.open() != 0) {
@@ -22,7 +24,11 @@ int main()
     }
 
     int read_size = opr.read(buffer, sizeof(buffer));
-
+    if (read_size > 0) {
+        std::cout << "要发送的数据大小：" << strlen(buffer2) << "\n";
+        int write_size = opr.write(buffer2, strlen(buffer2));
+        std::cout << "实际发送的数据大小：" << write_size << "\n";
+    }
 
     return 0;
 }
\ No newline at end of file