Concrete quality is the key factor to affect the frame structure of pre-stressed anchor cable (bar) and also directly affects the slope reinforcement effect. High slope frame cast-in-place concrete is restricted by field conditions with segregation, uncompleted vibration tamping, slurry leakage, template swell and high labor cost, all the above can be effectively solved by dry spraying concrete. Combined with the successful experience in the pre-stressed anchor frame construction in Xiaochangba mine environmental restoration project (the second phase) of Gansu Province, this paper introduces the technical points of the dry spraying concrete construction technology.