Magnetron is a type of crossed-field oscillator valve, which is widely used in microwave system. Its main characteristic is high power, high efficiency, low working voltage, small size, and low cost etc. Magnetrons can be classified as the Continuous Wave Magnetron and the Pulse Magnetron. Continuous Wave Magnetrons mainly used for microwave heating in industrial, agriculture, and mining etc, while pulse magnetron used for precision measurement in radar, airborne radar, and kinds of linear accelerator