Abstract: Multi-body dynamics simulation software Recurdyn is used on Coal Mine Drainage emergency vehicles to construct unilateral obstacle model. The model is used for unilateral obstacle simulation analysis. It is focuses on the effects of different barriers and different speed for independent crawler drive wheel torque. The simulation results show that: with the increase of barrier height and operating speed the driving wheel torque non-linear increases and not exceed the maximum torque of the critical design. Due to the different of rotational energy of independent track in instant obstacle, causing about driving wheel torque difference. Through this prototype simulation analysis provides a reliable basis for the actual vehicle safe and stable operation and further optimized.