1.1 jet pump structure. Jet pump structural parameters include area ratio m, throat l2, throat length l4, roar pipe import angle α1 and diffusion angle α2 five factors. Where m = F2 / F1 = (d2 / d1) 2 is expressed by describing the performance of the liquid jet pump and the following three parameters: flow ratio q = Qb / Qa head ratio h = [(HcZc + Vc2 / 2g) Efficiency value η = qh / (1-h) 1.2 The structural parameters of the jet pump on its performance According to a large number of domestic and foreign scholars, when the range of values ​​is: m = 2-9, l2 = 1-6d0, l4 = 4-9d2, α1 = 150-1200, α2 = 0-140, v0 It can be seen that the influence of each structural parameter on its performance is as follows: (1) The area ratio is the main parameter that affects the jet pump, and m = 3-4 is the high efficiency zone. (2) throat distance l2 = 1.0d0, the jet pump has a high efficiency point. (3) The diffusion angle has a great influence on the performance of the jet pump. When 40 <α2 <100 is the high efficiency area of ​​the jet pump. (4) The inlet angle of the throat has less effect on its performance. (5) The length of the throat has a great influence on the efficiency of the jet pump. Because the experimental result is different with the selected range of the boundary conditions, the influence of the various factors on the performance of the jet pump varies.