Abstract: The characteristics of various biometric recognition technologies at present are comparatively analyzed. The advantages of face recognition technology application in AFC (automatic fare collection) system are summarized. The overall architecture of face recognition technology application in AFC system is proposed. Face recognition gate operation process is constructed by combining conventional AFC system and two-dimensional code gate system. The advantages and precautions in practical use of face recognition system in the mixed mode of face recognition and two-dimensional code are described. The system can flexibly set up a system architecture. When the twodimensional code operation and the face recognition operation are complementary, the failure degradation mode is used to ensure the passengers pass through the gate to the maximum extent, and improve the service quality and brand image of the metro company.