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To reduce the theft rate of the car and meet the intellectualized auto-guard demand of people,we proposed an auto-guard system which combined the radio frequency identify technology and the global mobile communication network. The system took Texas Instruments Company' s car-used microcontroller STM8AF51AA as the control core. NXP Semiconductors Company's radio reader IC MF RC522 could identify the car owner quickly and then realized the function of keyless entry and keyless start-up.At the same time. The infrared sensors and vibration sensors completed the monitoring function. GSM module SIM300DZ of Simcom company finished setting and dismissing the prevention of message or call and controlled the car's states remotely through AT instructions. lt has showed in practice that compared with the traditional auto guard system, this system could not only identify the owner singly, but also improve the security and reliability. So it has achieved the unity between intellectualized safeguard and remote control.