Abstract: The paper introduced a method that using SIMOREG DC-MASTER 6RA70 rectifying device to realize 12-pulse serial rectification technology and then realize DC speed-regulation control of hoist. It described setting of driving parameters of 12-pulse serial rectification. The 12-pulse serial rectification technology has been used in DC speed-regulation control system of Nantun coal mine. The application result showed that the technology got over the abuses of increasing capability of 12impulse parallel driving in order to meet safety hoisting under fault state, and realized safe and reliable running of hoist under different states, the technology eliminated basically fifth and seventh harmonic generated by 6-pulse rectification, reduced interference for power grid and communication and control circuit,and decreased false action and damage for PLG exact electron device.