The shape of magnesium strip anode is flat, the length can be adjusted, easy to bend, good anti-corrosion function, do not need external DC power supply, automatic operation after installation, do not need maintenance, cover an area of less, low engineering use, and the external environment does not have any interference. Scope of application: for high resistivity environment, protection of pipe in casing, temporary cathodic protection of pipeline, protection of storage tank and pipe network, ground grid against strong electrical interference, etc.