Abstract: The engineering geological conditions of Banmiaozi gold ore in cold mining areas are complicated，and its surrounding rock is fractured and poorly stable.According to application of traditional dry shotcrete + slit wedge tubing blot + resin bolt support method with lots of problems that contains shotcrete cracking，roadway deformation and caving，the wet shotcrete + resin blot support method is used to support weak rock mass roadways at present.The relationships between dosage of cement and slump and flow of fresh shotcrete and strength of hardened shotcrete were studied by mix proportion tests with three kinds of aggregates and the optimal mix proportion was determined.Meanwhile，measures of temperature control that include preheated water，and indoor insulation of cement and reducer are proposed because of the influences of temperature on mixture in cold mining areas.Application in the fields of the mine shows that wet shotcrete is 3~4 times as much as the production of dry shotcrete，the uniaxial compressive strength with curing 28 days is 36.2 MPa，the destination to support steadily underground roadways is achieved and the general costs are reduced by 215.65 yuan per cubic meter by using wet shotcrete in place of dry shotcrete.Overall technique and economic benefits of shotcrete are greatly improved.

Key words: Cold mining areas, Wet shotcrete, Mix proportion test, Temperature control