Because of the shortcoming of dual-loop control based on coordinate transformation method for single-phase fourquadrant rectifier, the mathematical model on rotational coordinates was proposed. The improved algorithm based on current state feedback and predictive current control was proposed and implemented. The control method could not only control the active and the reactive of the line current exactly, but also had good dynamic response. Simulation software was used to build the system model and calculation methods, and the mentioned two control methods were compared and verified. The simulation results showed that the improved control methods could ensure stable operation of single-phase four-quadrant rectifier, with better dynamic performance.