Abstract: The experiment of Three-phase full-bridge controlled rectifier is the basic experiment of Power Electronics experiment course. The inverter and variable-frequency experiments are based on the experiments, is also the basic circuit of electric motor and driving experiment course. Through the experimental teaching we can found that in the subsequent experiments in these problems, most of the situation due to the three-phase rectifier circuit itself. Therefore, it is necessary to have a clear idea on the phenomena of the three-phase full-bridge controlled rectifier experiment, and quickly find out the problem and solve it.