With the popularity of the concept of green energy, reducing the harmonic pollution of power equipment to power grid has become an important research topic in the field of power electronics. This paper takes three-phase current-source PWM rectifier system as the research object, and it presents a current-source PWM pulse signal tri-logic control method, and puts forward a pre-modulation method. Then the topology of the system is studied and a new equivalent model is proposed. After that the closed-loop control strategy of the system is studied, and a PI tuning method is obtained. Finally, the control strategy is simulated by PSIM and the experimental platform is set up for experimental verification.