Using a kind of mixed-flow pump as the object of the study,the time-averaged continuity equation with relative coordinates and the N-S equation are established on the basis of FLUENT software,and the numerical simulation was made by using standard k-ε equation with turbulence model,unstructured tetrahedral network and SIMPLE algorithm .On the basis of the irrelevance of grid number, the static pressure and absolute velocity distributions of impeller blades and stator blades were calculated.And the water resistance coefficient simulation when it is static and the performance parameter simulation when it is rotary were made under different number of stator blades and different inlet angle of stator blade. When the number of impeller blades is 4 and other parameters remain unchanged ,the water resistance coefficient is lowest when the stator blades number is 3, and the head and the efficiency are highest when the stator blades number is 9.When other parameters do not change, the inlet angle of stator blade are +2.5°、0°、-2.5°, the water resistance coefficient was lowest 、 the head and the efficiency are highest when the inlet angle of stator blade is 0°,and the water resistance coefficient,the head and the efficiency don't change significantly.The results show that under special environment the number of stator blades should be taken less to obtain lower water resistance coefficient when the requirements of the design efficiency were insured,and when designing space diffuser to obtain lower water resistance coefficient ,the mixed- flow pump performance have no significant change when the inlet angle of stator blade changed in the range of about 5°.
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