Base on the characteristic of laser propulsion, an investigation was performed to find out the mechanism of the interaction between laser and propellant gas.

As control force source, the solid propellant gas generator was used to exert lateral force for the end control and the turn of vertical launching of missiles.

Only when the resonant cavity of microwave Plasma Thruster (MPT) is under the resonant state, the microwave energy can heat propellant gas to produce thrust efficiently.