【正文】 ity life, puter techno logy, automatic control technology and power electronic technology rapid development, the elevator has bee a symbol of urban material civilization. Especially in highrise buildings, the elevator is an indispensable vertical transportation equipment. Traditional relay elevator control system, due to the mechanical and electromagic relay inertia big, greatly reduces the reliability and security of the elevator system. In order to ensure the efficiency and reliable securities, the control method of elevator must be changed. The programmable logic controller (PLC), which develops based on sequence logical control, is digital operation electronic device specialized in the industrial application environment. PLC possesses fast process speed and high reliability. Therefore, PLC can be able to ensure the elevator run normally, securely and reliably. In addition, the drive method of elevators has replaced the DC velocity modulation with frequency control due to the development of AC frequency control of motors. The frequency control not only satisfies the fort sense of passengers and ensures the stable precision, but also decreases the loss of power, saves resources and reduces expenses. The frequency control method based on PLC is applied to the elevator system and further researched. 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