Based on the principle of the minimum resistance, the optimum design of suction and discharge passages of pump system was made with CFD numeric simulation. Two sets of new S-shaped, façade and plane, shaft extension tubular pump were developed. A physical model experimental research on energy performance, cavitation performance and runaway characteristics of the pump model system has been conducted on the high precision hydraulic machinery test stand. The results show that the highest efficiency of the plane S-shaped extension pump system is 83.32% at the blade angle −4°, the maximum difference value of pump system and pump is 6.02% at the optimum operating condition. The highest efficiency of the facade S-shaped extension pump system is 83.55% at the blade angle −2°. Two sets of S-shaped shaft extension tubular pump systems have significant advantages of high efficiency and energy-saving.

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