In order to research the relationships among flow coefficient, head coefficient and specific speed of high-speed partial emission pump, the main parameters of the pump were optimized designed. Based on the experimental date of pump performance, the test date were numerically fitted by Matlab software and the function of those was obtained. The optimized parameters were modeled by Pro/E, and both the numerical computation with ANSYS-CFX and external characteristics test were carried out. The results show that the static pressure of symmetrical section can satisfy the optimization requirements. Although there exist swirls in the stream contours, the unexpected flow field with back flow and vortex component near the tongue were distinctly improved. From low flow rate to design condition, the pump performance of H-Q test curve is very smooth, and which provides a certain reference for practical engineering.
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