In order to understand the internal pressure pulsation characteristics of the water jet propeller, the contra axial water jet propeller is taken as the object of study and based on the computational fluid dynamics(CFD)method with the SST k-ω turbulence model is used to close the equations.A mesh independence analysis shows that the calculated power and head are well consistent with the design data. In waterjet inlet and first impeller, two stage impeller clearance between the impeller and the diffuser and the secondary impeller set between the monitoring points, monitoring the pressure data in different positions. The time domain and frequency domain diagrams of each monitoring point are obtained, and the pressure fluctuation characteristics of each monitoring point are compared and analyzed. Under the design conditions, according to the pressure pulsation of the water jet propeller at the same design position, the pulsation distribution of the propeller at different speeds is compared and analyzed. The results show: The first impeller of the propeller mainly affects the pressure fluctuation at its inlet,and the secondary impeller mainly affects the pressure fluctuation at the two-stage impeller clearance; at low ship speed, the vane mainly affects the pressure pulsation at the secondary impeller exit; in the axial direction of the propeller,due to the two-stage impeller counter-rotation,the amplitude of the pressure pulsation changes the most. At high ship speeds, the pressure fluctuation between the secondary impeller and the vane changes drastically
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