Abstract: Current harmonics resulting from inverter nonlinearity and motor design defects can cause torque pulsation and increased losses, which can negatively impact the control performance and shorten the motor operation life. The quasi-resonant controller implemented with two integrators is effective in suppressing current harmonics. However, using Euler discretization for the integrators can lead to resonance point offset and phase lag. In order to solve this issue, this paper propose an improved quasi resonant controller with two integrators, using a zero-pole decoupling correction model that accurately tracks resonance poles, offers high stability margins, and minimizes the computational burden. To ensure stability of the current control system with the added quasi resonant controller, it perform a stability analysis and select appropriate control parameters, considering system sample and update delay. Experimental comparisons demonstrate the effectiveness of the proposed improved discrete quasi-resonant controller.