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This paper mainly introduced the basic structure and work principle of transmission agent on electric drilling rig, meanwhile the frequency control and parallel operation of motors used in the transmission agent were analyzed and designed. Using parallel operation could realize balance of power and load towards motor, using frequency control could realize fuzzy PID control. It can well accomplish two important missions-parallel operation and speed control with applying AC converter technique to control the winch motor. So it will ensure the drilling stability and safety as well as improve automation level.