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For automobile using the way of traditional mechanical to open door with the problem of complex operation and low safety , designed the car intelligent access control system. By car base station with smart key dual communications, opening and closing of the door, according to a key position, but also to achieve a key to start the engine. Considering the randomness and variability of wireless communication, in order to ensure security of signal transmission, systems used the AES encryption algorithm, adding a cyclic extension of dynamic keys, and the entire system for modeling and simulation of MATLAB. Experimental results show that the system encryption performance was good, password cracking was only, when the SNR is 10dB, the system bit error rate of less than10-4, meeting the performance requirements of wireless communication systems.