Abstract: In order to solve the problems of dry shotcrete machine, such as easy blocking pipe, high dust concentration, high rebound rate and low compressive str ength, PS6I wet concrete shooter machine was designed which adopted a structure of independent pulping machine and a slurry pump, it was easy to control the materi al proportioning precisely and mix the dry and wet materials. Besides, wet and dry material were transported separately to improve the quality of working atmosphere, a nd effectively guarantee the continuous transmission of wet material and the spray concrete continuous operation ability, which also greatly reduced the dust concentrat ion and the risk of blocking pipe. The concrete samples and rebound material different from dry shotcrete machine and PS6I wet concrete shooter machine were collect ed and the dust concentration of each district was tested. The uniaxial material tests and theoretical calculation were applied to analyze the technical and economic ind ex for both of them. Compared to dry shotcreting, PS6I wet concrete shooter machine rebound rate decreased 10%, its concrete compressive strength increased 22. 4% and the dust concentration decreased 46.1%.