The resonator is an important part of the laser oscillator. In general, it is very difficult to make a laser work ideally because it is quite difficult to adjust the two end mirrors of the resonator to a completely parallel state. Besides, when the cavity mirror of the resonator is slightly disturbed, the output of the laser will fluctuate greatly, even disappear. For all conventional plane-plane, plane-concave and concave-concave cavity lasers, these problems are inevitable. Poor prisms or cube-corner prisms have been used as the reflector of the laser resonator to improve the stability of the laser. In addition to alignment and power stability issues, the development of the movable resonator has special application values. The resonant beam charging (RBC) is a wireless power transfer technology which transfers power through the intra-cavity resonant beam. The mobility of the resonant cavity is the premise of the resonant beam charging system to realize the movable wireless power transmission. For the resonant beam charging system, the transmission power and efficiency when the output mirror moves along the axis of the resonant cavity have been demonstrated. However, the mobility of the resonant beam charging system along the horizontal direction needs further study.