Visualization simulation was carried out for fan nozzle flow field by using Fluent software.Effect of flushing pressure on the jet wash performance was analyzed and calculated, and effect of striking distance and attack angle from the perspective of the cleaning effect was analyzed,so as to help determine a more reasonable jet parameters. The results show that with the increase of inlet pressure, flow and forces is increased significantly; for a particular specification of the nozzle, the strike angle of 15° is more appropriate.