Abstract: The effects of the inflow velocity, area ratio, outflow structure and suction gap on the flow field of the reverse flow diverter were experimentally investigated and simulated based on the N-S equation and the RNG k-ε model. It can be found that the suction factor predicted by the CFD method adopted in this study is similar to that obtained from the experiments, and the entrainment phenomenon is obvious under the conditions that the area ratio is 1.5, the outflow structure is the diffuser and the suction gap is 7 mm and 10 mm.