In this paper,according to the need of reactive power compensation of power system. A novel medium voltage switch with diode and high speed switch(HSS) in parallel connection is presented. It is to solve the problem of inrush current and over voltage when interruption and making capacitor bank used in reactive power compensation of power system.This paper introduce the basic structure of hybrid-switch and its principle. Analyzed the hole process of current commutation in the hybrid-switch and the diode during the interruption and making in detail and how to use the diode’s feature of natural zero crossing point to allow the HSS cooperate. The transient model is built to simulate and the experiment to verify. Compare with traditional vacuum switch, the simulation test results show that the hybrid middle-high voltage switch reduce the inrush current and over voltage. This paper also discuss the control strategy for different connections of capacitor bank. The result show that the hybrid switch can effectively reduce inrush current and over voltage during the interruption and making capacitor bank. Then it verifies the effectiveness and the reliability of hybrid middle-high voltage switch.