In order to study the wear law of the cylinder liner and piston ring on the using condition of the diesel engine,a simulation method for the wear of cylinder liner and piston ring for a 12150 type multi cylinder diesel engine was established and verified.The influence law of the environment and working condition parameters on the wear of cylinder liner was investigated.The results show that the wear depth of cylinder liner is decreased first and then increased with the increasing of atmospheric temperature.When the temperature is -5 ℃,the wear depth is the smallest,which is 589% lower than that of - 35 ℃,and 915% lower than that of 40 ℃.The wear depth of cylinder liner is decreased first and then increased with the decreasing of air pressure.When the air pressure is 80 kPa,the wear depth is the smallest,which is 5.89% lower than that of 100 kPa.When the air pressure is 50 kPa,the wear depth is the maximum,which is 8.48% higher than that of 100 kPa.The wear depth of cylinder liner is increased with the increasing of diesel engine speed,and the minimum point appears at the 1 600 r/min.The wear depth under 2 000 r/min is increased by 46.76% compared with that under 1 200 r/min.The wear depth of the cylinder liner is increased with the increasing of the load of diesel engine,and the wear depth under 100% load is increased by 133.96% compared with that of 20% load.