The basic principle of measuring method of friction coefficient by using wheelrail friction testing device was described,and the composition parts of the testing device were introduced.Through measuring noload wheel resistance and the braking force required to stop the rotation basically for different loads at different wheel speeds as well as calculating the corresponding braking torque,the overall trend of the braking force and the corresponding friction coefficient under the different load were obtained.The results show that the friction coefficient of wheel and rail is between 016 and 018 at different loads and wheel speeds,which is consistent with steel and cast of wheelrail,also it is verified that the friction coefficient and the temperature are negatively correlated in friction region and the wheel braking force and the load are positive correlation.Therefore,the measuring method of friction coefficient by wheelrail friction testing device is close to the actual working condition,which is suitable for the measurement of the friction coefficient of different material combinations.