Abstract: Analyzing the fatigue fracture caused by vibration is main fracture reason of the external lubricating oil pipe of a comprehensive transmission device, three improvement schemes of increasing support scheme, adding vibration isolation structure scheme and hose connection scheme were proposed and compared and verified. The analysis and experimental test results show that the three improvement schemes can effectively suppress vibration and improve fatigue strength. The effect of the improved scheme is better in-order to increase the support, rubber vibration isolation and hose connection, and the amplitude is attenuated by 88.29%, 77.87% and 62.04% respectively.