Abstract: The paper introduces distortion monitoring and salic features of Three Gorges hydro junction right bank underground power station water intake of water diversion tunnel in stage of construction, and analyzes preliminarily dimensional deformation and internal deformation of side slope of the No. 3 water diversion tunnel water intake. The outcome display that excavating the No. 3 water diversion tunnel didn’t induce solid rock to generate hazard distortion, and the rock mass in side slope is steady.