Due to the large amount of dust and wide range of pollution caused by open-pit deep-hole blasting,it is urgent to study an efficient and reasonable blasting dust suppression technology for green mine construction.Through field test,the paper reveals that the dust sources of deep-hole bench blasting in open-pit mainly include three parts:ejection of blasting-hole stemming,breaking and crushing of rock,and scattering of surface.Besides,the dust production is closely related to groundwater,lithology and blasting mode.Therefore,a three-dimensional water mist suppression model was designed by using water bags to stemming the holes and be exploded into water mist in front of the bench surface of the blasting and throw area.Through the special tests of the water bags explosion,a reasonable design parameters of water bag explosion were obtained,the optimal explosive consumption for water bag explosion is 0.4~0.5 kg/m3.The field tests and applications show that the reasonable water bags spacing is 5~10 m,the delay time of water bag blasting is 1.0~1.5 s than that of hole explosion,and the stemming length of water bags is less than 4 m.The comprehensive test results reduce the concentration of blasting dust by more than 50%,and the method of dust suppression by explosion water mist is simple and effective.