Abstract: Abstract: The paper carries out the relevant technical studies on Resonant Impedance Type Active Power Filter (RITHAPF) for the harmonic mitigation and reactive power compensation of a 6kV mine hoisting system. The structure and mathematical model of RITHAPF is analyzed in this paper. A discrete decoupling mathematical model for two-level APF is constructed and the current tracking controller is devised based on discrete SMC. Systematical simulation results demonstrate that the proposed RITHAPF is capable of compensating harmonics and reactive power for the 6kV hoisting system and effectively suppresses the hoist start overshoot.