Abstract:In view of the error factors of the train wheel tread parameter detection system those were the eccentricity between the wheel axis and rotation center, the centration between the sensor probe and rotation center, the intersect angle between the sensor probe and measuring surface, the tilt angle between the wheel axis and rotation center, the error factors influence model of the train wheel tread parameter detection system was established. The influences of the error factors on the measurement values of the wheel tread parameters were analyzed and compared. With Pro/E software, the threedimensional geometric model of the LMA standard wheels was established, the analog sampling parameters were set and section sampling was made. By using MATLAB software, the data were simulated and analyzed. The results show that the simulation results and the setting values are consistent.