The buffer circuit of the hydraulic lifting system not only makes the system structure complexly, but also cannot achieve full coverage to the whole lifting stroke, when running to the end of the stroke, the buffer cannot be achieved. To achieve smooth discharge in the end of the dump truck lifting, another mean is used to achieve buffer. According to the structural characteristics of dump truck hydraulic lifting mechanism, the buffer device was designed, and the hydraulic cylinder end cushioning device was designed. The device work process was analyzed. The system analysis model was built based on Simulink and the speed change and each chamber pressure change of the lifting cylinder were analyzed. The sample hydraulic lifting mechanism for cushioning device performance analysis was built. Comparative analysis shows: cushioning device for dump truck can achieve good working conditions of various lifting performance requirements; buffer device makes the system achieve stable buffer under the maximum pressure and minimum pressure;the analysis results and the test results of the lifting cylinder elongation are consistent,indicating the reliability of the design and analysis.It provides reference for similar design.