The solid-liquid two-phase flow equations of the draining-sand jet pump have been established according to the RNG k-ε two-equation turbulence model. On this basis, the numerical analysis models of different diameter fitting of the nozzle and the throat were established. Then, the characteristics of efficiency and outlet pressure of the diffuser and solid phase ratio and velocity field distribution and pressure field distribution were analyzed by the computer software of computational fluid dynamics. The numerical analysis results were studied and contrasted with another one. To reduce or eliminate the contrary velocity vector of the solid-liquid two-phase flow and to increase degree and range of the vacuum are the key techniques for improving the comprehensive properties of the draining-sand jet pump by optimizing the diameter fitting of the nozzle and the throat. They have been proved by the results of numerical analysis and the production experiment.
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