A kind of hydraulic punching press that is widely used in the buffer system is researched to realize the vibration and noise reduction in hydraulic punching process, and a comprehensive system of hydraulic characteristics of the buffer model and dynamic model of the buffer process is established based on the buffer mechanism analysis, using the Matlab software to calculate and analyze clarifies the role of the buffer working point, throttling damping, working area of the buffer cylinder and the relationship between the buffer cavity volume and the effects of buffer. The structure of buffer system is reasonable, innovative and practical and can be referred by the same kind of product.