对液压系统的主要元部件—液压泵的主要故障模式 ,详细研究了其失效机理 ,提出了相应的故障诊断方法 ,并利用试验系统对故障诊断方法进行了验证。研究表明 ,通过对液压泵压力信号、加速度信号及回油流量信号的测试 ,利用相应的故障诊断方法 ,可以有效地实现多故障诊断。本方法也适用于直轴泵 The main components of the hydraulic system - the main failure mode of the hydraulic pump, the failure mechanism is studied in detail, the corresponding fault diagnosis method is put forward, and the fault diagnosis method is verified by the test system. The research shows that through the test of pressure signal, acceleration signal and oil return flow signal of hydraulic pump, the multi-fault diagnosis can be effectively realized by using the corresponding fault diagnosis method. This method is also suitable for direct-axis pumps