Magnesium anode has high driving voltage, low current efficiency and high cost. Depending on the shape and the electrode potential (open circuit potential), magnesium anodes can be used in soil or freshwater environments with resistivity ranging from 15 ohms · m to 150 ohms · m. Generally do not apply to soil resistivity less than 10 ohms · m environment. The high potential magnesium anode has a potential of -1.75V CSE and a driving voltage of 0.85V. The low potential magnesium anode has a potential of -1.55V CSE and a drive voltage of 0.7V. The operating temperature can reach 100℃. When the remaining amount of the sacrificial anode is 15% of the initial weight, that is, the anode is considered to be invalid, so the utilization rate of the anode is generally 85%.