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With the car more to the development of intelligent and humane, PKE system will become the mainstream vehicle access control system. This paper introduces a new smart car keyless door control system design, give a specific software and hardware design, and design of the key technologies described in detail. The system is low power consumption, send and receive distance, reliability and safe, with good prospects. Key words: passive keyless door control intelligent transponder KEEL OQ roll coding SAW resonator