To meet the water supply demand of a power plant, the water intake engineering construction (containing water intake shaft, draw water tunnel and open diversion channel) at a reservoir was needed. By means of the top-down method of excavation with lining alternated in short segments, guiding cavern water from shaft wall was derived as a part of the water source, and the shaft construction was completed with dry bottom-sealing. By pipe jacking and pipe top grouting technologies, draw water tunnel was accomplished in the strata with broken rocks and abundant water inflow; by the rock plug blasting, the connection of the tunnel and the reservoir was successfully realized; and by percussive trenching technology, open diversion channel was constructed.