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轴向柱塞泵为流固耦合机械设备。工作时，振动特性较为复杂。使用特征线—快速傅里叶变换法（ MOC-FFT）对柱塞泵中由流固耦合所引起的振动特性进行了研究。利用特征线法求解流固耦合振动偏微分方程（1），得到时域信号，再使用快速傅里叶变换法，可得到管道系统的固有频率。该方法既拥有特征线法针对耦合振动建模清晰，计算简便等特点；又利用快速傅里叶变换法将振动特征转换至频域中。通过对频域振动特性的研究，得出A10V型柱塞泵工作中应避开的工作振动频率成份，以及斜盘摆角、压力、转速对柱塞泵由流固耦合引起的高频振动谱线影响变化规律。“,”Axial piston pump is fluid-solid coupling mechanical equipment. Its vibration characteristic is compli-cated when working. This paper uses the characteristic line-fast Fourier transform method( MOC - FFT)in the plunger pump to study vibration characteristics caused by fluid-solid coupling. Using the MOC to solve the fluid-solid interaction’s(FSI)partial differential equations(1),then the vibration characteristics of pipeline system in time domain can be achieved. Using the fast Fourier transform method,the natural frequencies of the piping sys-tem can be obtained. It has the advantage of characteristic line method for the coupling vibration model is clear, easy to calculate;And using the method of fast Fourier transform the vibration characteristics to the frequency do-main. According to study the vibration characteristics in the frequency domain,this paper achieved the frequency which the type of A10V pump should be avoided when working and change rules of the angle of swash plate,pres-sure and the speed of rotation how to affect the intensive frequency vibration spectrum which is caused by the FSI.