Abstract: The design, material selection and installation of anode-string deep well anode are introduced in the article. The deep well anode is mainly used in the cathodic protection system that is at a narrow surface or at the soil with a high resistivity. The advantages of deep well anode embody that there is a relevant distance between the anode and the protected structure, which makes the distribution of protective current evener, and meanwhile, the corrosion disturbance to other buried metal structures reduced.