Ring laser gyro is a kind of sensor which uses optical principle to measure angular motion. Its performance determines the performance index of weapon system directly. It is known as the “eye” of weapon equipment. Laser gyro does not use high-speed rotating rotor, with high reliability, fast start-up, large dynamic range, easy maintenance and other outstanding advantages, it is a key component of inertial navigation systems, attitude control systems and positioning and orientation systems of various weapons and equipment. At the same time, laser gyro and its application technology also have very important applications in civil aviation, intelligent manufacturing, rail transit, oil drilling and other civil fields.