Abstract: In order to grasp the wheel set wear of urban rail transit during the train operation, this paper established a locomotive and track multi-body dynamic model based on the actual wheel/rail parameters under a subway line network, and simulated the contact relationship of actual wheel-rail. The wheel-rail contact variables output by the dynamic model were combined with the contact spot analysis algorithm to analyze the wheel-rail contact spots, and implement the calculation of the sliding vector and the definition of the stick-slip zone within the contact spots. The paper used an Archard abrasion model to analyze the sliding area in the contact spot, and obtain the vertical wear distribution in the contact spot. Finally, the paper used the contact variable analysis-abrasion calculation-profile updating as the main structure, used the wheel set wear simulation process to simulate the wheel-wear abrasion process multiple times, and complete the establishment of the wheel set wear model. The accuracy of the model was verified by comparing the model output profile of wheel set with the measured profile.