Abstract: A novel microstrip switch was developed based on micro-discharge plasma. The plasma switch is a dynamic device of microwave component to control the propagation of electromagnetic wave on the microstripline structure, which has a similar structure as RF MEMS switch but replacing its connecting anchor by using time-varying plasma. A basic structure of plasma switch contains a microstrip line with a small gap which is able to block electromagnetic wave and a discharge configuration which can generate a sheet-like plasma. When the discharge is turned on, the electromagnetic wave will transmit through the gap with the help of the conductive plasma, resulting in the ON state. When the discharge is extinguished, the electromagnetic wave energy will be reflected by the stripline gap, realizing th