The importance of three-phase pulse width modulation（PWM） converter for improving power quality is clarified. And a powerful three-phase PWM current source rectifier based on dual rectifier bridges with hybrid switch is proposed. This rectifier uses silicon controlled rectifiers（SCR or thyristors） and controllable switches as well， to compose three-phase current source rectifier with PWM function. It can reduce cost of the high power rectifier meanwhile decrease input current total harmonic distortion（THD） and in favor of DC power control. The operation principle of this rectifier is also analyzed. The relationships between the working frequency of the circuit and the turn-off characteristic of the SCR， THD of the line current and the output voltage range are plotted， thus it provides the guidance of the novel rectifier design. The experimental results verify that THD of line current of the rectifier is less than 5%.