Abstract:Face Recognition technology is the composite application of biotechnology and computer technology,the demand for safety and reliability of access control system becomes higher and higher in market.The design scheme of door security system based on ARM9 was presented.Firsrly,effective features were selected,and the algorithm of face detection and recognition was briefly introduced,then according to the implementing principle of the algorithm,the design scheme of hardware system was described in detail.Finally,the algorithm was security system based on face recognition system was implemented.The experimental results demonstrate that the system works reliabily and speedly,an the function of door security system was realized.