When the automobile is assembled, the main purpose is to transmit the real-time production data and quality monitoring data collected from all kinds of automobile production lines to the material management, production scheduling, quality assurance and other relevant departments, so as to better realize the functions of raw material supply, production scheduling, sales service, quality monitoring and vehicle life-long quality tracking. Before the application of RFID technology, bar code is the main way to store car body information. The advantages of bar code identification method are flexible configuration and low system cost. But because the body information is stored in PLC (programmable controller) or PMC (production and material control) database, so the speed and reliability of network communication are very high. It requires high-performance PLC, large capacity database and high-speed PMC host.