The Power Electronics Training System consists of 28 experimental modules, a three-phase squirrel cage motor, load, control and measuring devices. It inculde single-phase rectifiers, three-phase rectifiers, DC choppers, inverters and application experiments. Popular circuits of power electronics contain rectifiers, choppers and inverters. The is the combination of power, electronics, and control. It has wide the applications of solid-state electronics to the control and conversion of electric power. The experimental for modules includes converter, power supply, load, control and testing modules. These experimental modules and instruments will be introduced and demonstrated in the subsequent experiments.