Aiming at problems of phase tracking and powe，when induction heating power supply working athigh frequency state，according to the characteristics of series resonant，a phase tracking method of induction heat-ing power supply based on TMS320F2812 is used to solve those problems． The method makes load equivalent im-pedance low inductance． We studied the schematic diagram of the signal processing circuit，discovered the methodof producing phase-shift PWM signal by TMS320F2812，and studied how to drive power MOSFET，also built exper-iment platform for experimental verification． According to the experiment results，we can see that phase signal pro-cessing circuit send phase signal of voltage and current to the TMS320F2812 rapidly and steadily，and thenTMS320F2812 can produce phase-shift PWM signal so this the phase tracking method is effective and stable．