With the four-blade mixing and jet blowing composite desulfurization mixer as the research object,the mixing flow field speed was optimized by adjusting the process parameters such as mixing speed,insertion depth and nozzle ventilation flow.The test scheme was designed based on the response surface method,significantly affects the flow field velocity and verifies the response surface model using orthogonal test interaction factors.The test simulation results show that the optimal process parameters of the mixing flow field of the desulfurization agitrer is:the mixing speed 170 r/min,insertion depth 400 mm,nozzle ventilation flow of 4.408 m3/h.At this time,the flow field speed value predicted by the model is 0.536 m/s;the insertion depth has a more significant impact on the mixing flow field speed than the mixing speed and the nozzle ventilation flow.