Aiming at the phenomenon of unreliability of prism laser gyro ignition, the ignition method of laser device resonator excitation based on external electrode loading high frequency electric field is systematically studied. The factors influencing the acquisition of laser gyro ignition voltage are theoretically analyzed. Based on this, two measures are proposed to increase the ignition reliability of the resonant cavity. By shortening the distance between the ignition cathode and the ignition anode, the required ignition voltage value of the resonant cavity is effectively reduced, making it easier for the working gas to be locally excited, and then produce an avalanche effect, so that the entire internal space of the working gas is excited, to achieve the normal continuous operation of the laser device resonator. the experimental results show that the optimized laser gyro resonator can achieve more than 99.9 % reliable ignition at high, low and constant temperatures.