Plasma is one of the four basic forms of matter. In recent years, it has been widely used in energy, materials and national defense. Microwave reflection method is one of the common methods for microwave diagnosis of plasma. It is usually used to determine the electron density distribution and electron density disturbance of plasma. In plasma, the critical interface position of reflected microwave changes with the change of incident microwave frequency. By changing the frequency of incident microwave and measuring the phase change of reflected wave and reference wave by reflectometer, the electron density distribution of plasma can be obtained; If the frequency of the incident microwave remains constant, the disturbance of the plasma density can be measured.

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