Due to the outstanding advantages of harmonic gear transmission in practical use, in recent decades, this type of transmission has been rapidly extended to energy, radar, communications, machine tools, instrumentation, shipbuilding, automobiles, and conventional applications from aerospace vehicles and airplanes. Weapons, textiles, metallurgy, lifting conveyors, medical equipment and other related departments. Practice and use at home and abroad have proved that this type of transmission, whether used as a high-precision transmission for data transmission (for example, transmission error less than 10´´), or as a power transmission for transmitting large torque (for example, a transmission torque of 160kN·m or more) A more satisfactory result was obtained.