According to the research and development request of new deep well pump energysaving and materialsaving, test investigation was taken to increase the efficiency of deep well pumps by using hydraulic design of impeller, the modern CFD and the quadratic regression orthogonal test method. The experiment was carried out with two factors of outlet angle and outlet width. Ten impellers were designed through testing schemes of quadratic regression. The whole flow field of the twostage newtype deep well pumps at design condition was simulated by CFD, and the efficiency of each case was obtained. The effects of both outlet angle and outlet width on efficiency were investigated through quadratic regression orthogonal testing method. According to the calculation results, constrained quadratic regression equation of the efficiency was put forward. The result shows that it would be instructive to increase the hydraulic efficiency of newtype deep well pumps by using the impeller diameter maximum approach.
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