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RFID system is one of the market's most popular electronic products, radio frequency technology industry has good prospects for the industry. This paper carried a radio frequency identification technology (RFIT) in automobile anti-theft device research, radio frequency identification device proposed consists of two parts, namely, the transponder and the internal reader constitute the entire device hardware and software design and development, the first to build a hardware system's overall framework, focusing on RF card reader circuit design, including design choices and RF power RF circuits and peripheral components, software system design, focuses on reading cards and write card software design, and the corresponding timing diagram and flowchart program make the radio program reliable reading and writing purposes. It means this paper avoids the use of battery remote control device on the market, effectively achieve the purpose of anti-theft of car.