Abstract: In order to have the frequency converter applied to 660/1 140 V voltage in the underground mine at home and abroad, the diode position grabbing type t hree level switcher structure was applied to design the energy bidirectional transfer converter.The paper had a discussion on each circuit design of the converter and ea ch part parameters of the computer system. The paper introduced the selection method of the elements applied.Based on the above research method, the Matlab simula tion software was applied to the simulation analysis and finally the principle prototype and the product prototype was established.The results showed that the researche d medium pressure high power three level four quadrant converter with the excellent performances could be widely applied to each production cycle in the underground mine.