Abstract: The jet pump liquid in limited space with flow in irregular area belongs to high Reynolds number strong shear turbulent jet, therefore at present there is no complete and accurate formula that can express the flow of two kinds of different performance fluid mixing and diffusion in the jet pump. Based on the study of design and optimization method of jet pump by scholars at home and abroad, this paper selected the area ratio, throat length to diameter ratio and distance between throat and nozzle as the key parameters,with the goal to improve the efficiency and carry out the numerical calculations,and finally achieve a jet pump design,which efficiency increased by 6% than the initial design results. Consequently, the pump power is reduced.