Abstract: Owing to the big output pulsation and high vibration noise in traditional water hydraulic piston pumps, a water hydraulic pump driven by the linear motor was developed. To reduce the impact of vibration on the pump body when the motor reverses, to eliminate the phase error of multiple motor at runtime, and to realize the low vibration and constant flow output of piston pump, the single linear motor control mode, motor coordination control strategy and motor moving sequence were studied. Result shows that the optimal control method for reducing the vibration of the piston pump and keeping the stability of flow is that the four linear motors should start in optimized boot sequence, with running in triangular wave curve and interpolation synchronous control method under the SPLINE movement mode.