Fast and accurate sampling of system variables plays an important role in the digital regulation of power electronics systems, and it becomes a popular research subject; many researchers are invested in improving the sampling method by using Model Predictive Control (MPC) in recent years. This paper presents an improved model predictive method, which can be used to predict the moving average value of phase current in the three-phase two-level inverter accurately, even though the dead time and the zero-current clamping effect are present. This method is validated by simulation and experiments.