Studied on a commercial use of high reliability and efficiency of file transfer system. Based on the Socket transmission. Records and information of transmission through XML information interaction, Perfect transmission guarantee mechanism for transmission system design, when it transfers the file, the network transient fault, then the network recovery, the system can automatically recover the transmission, and it can transfer the file which not completed transmission. The system has the good fault tolerance; it cannot breakdown because of the abnormal transmission. The last, the commercial file transmission system has the detailed logging in an all-round way, when the system has the problem, it can position the problem accurately, and solves the problem. System configuration is simple, and easy to operate, when transfer the large file, supporting resume transmission, so it ensures the efficiency of transmission. The system test passed in Windows 7 Enterprise Edition system.