Abstract: According to the dust control difficultyt of the driving face and the application limit status of the internal spraying technology, a study on the internal spray ing technology of the driving equipment was conducted.An application status on the internal spraying technology of the driving equipments at home and abroad was inv estigated. The paper pointed out that the causes to limit the promotion and application of the internal spraying technology would be the nozzle easy to be jammed, the w ater seal easy to be leakage, difficult maintenance and others.From the water seal structure, flow channel design, fan type spraying features, spraying parameters and nozzle layout, the paper summarized the key technology progress of the internal spraying and pointed out that the problems existed in the internal spraying technology were the water seal hard to realize the long term sealing, the flow channel manufacturing technology hard to be guaranteed and the contradiction between the nozzle e asy to be jammed and the spraying pressure.Meanwhile the paper proposed that the internal spraying technology breakthrough conducted could solve the bottleneck pr oblem of the internal spraying technology and could improve the relability of the internal spraying system.