In order to reduce the switching loss of the single-phase inverter, improve the efficiency and power density, a discontinuous PWM modulation strategy based on the unified modulation method is proposed for the single-phase full bridge LC inverter. The differential mode modulation signal between a-phase and b-phase is constant, the common mode modulation signal is adjusted and injected into the modulation signals of a-phase and b-phase, the switching devices of a-phase and b-phase are in inactive state alternating, so the switching loss can be reduced. Then, the mathematical model of the single-phase full bridge LC inverter is established, the parameter design method of the single loop proportional resonant controller is studied according to the amplitude-frequency characteristic curve, the output voltage can track the reference signal without error under the disturbances of input voltage and load. Finally, the experiment is carried out, which shows that the switching loss can be reduced by the proposed discontinuous PWM modulation, and high quality and precision voltage output can be obtained by the single loop proportional resonant controller.