Stopping using high pressure hydraulic accumulators of hydraulic hammers has become a trend. In a hydraulic hammer without the hydraulic accumulator, the high pressure hose plays the role of the high pressure hydraulic accumulator. In order to research the influence of high pressure hoses on the performance of hydraulic hammers and to improve the life of hydraulic hammers, the mathematical model of high pressure hoses was analyzed, the simulation model was built by using the hose model and the hydraulic component design library of the AMESim software, the simulation analysis of the effects of high pressure hoses was done when hydraulic hammers were working. The simulation results show that high pressure hoses became one of the reasons that cause pressure instability of the front chamber, length and internal diameter of high pressure hoses both affect the working performance of hydraulic hammers.