Abstract: Objective: When passengers who have activated face recognition payment service use touch payment at metro gate machine, their information might be collected by face recognition terminals on the gate machine, resulting in erroneous generation of face recognition payment transaction data and duplicated charges. This problem needs to be solved. Method: According to the payment habits of passengers at gate machine, there should not be face recognition payment when touch payment is used. Based on this, a scheme to avoid duplicated charges in metro AFC (automatic fare collection) system with face recognition payment is proposed, and an adaptive algorithm for gatepassing and unilateral trip is specifically proposed, meaning that at the gate machine, when both face recognition payment and touch payment requests are initiated for the same passenger in a short period of time, only the touch payment transaction data will be generated while the face recognition payment transaction data will not be generated, thereby avoiding charges for face recognition payment; additionally, when the system performs a daily cutoff, the face recognition payment for similar trip (transaction data is generally the same) by the same passenger will be automatically deleted, thereby avoiding charges for this unilateral trip. Result & Conclusion: Without affecting the normal gatepassing of passengers, this method effectively avoids the erroneous generation of face recognition payment transaction data and eliminates erroneous face recognition payment of unilateral trip during the system daily cutoff, thereby effectively solving the problem of face recognition payment duplicated charges.