A substation automation technique training system based on digital simulation and AC driving is introduced， which is a new functional training system oriented to maintainers for substation secondary equipment. The system has rich and practical training functions and training contents， and can give a real and full presentation of the functions， performances， features and even defaults of the substation secondary automation devices and system. Its main technical features are: the electric power network and equipment adopts real-time digital simulation based on computers so that its various operating status， faults and anomalies can be simulated; the substation secondary system adapts a real substation secondary automation equipment and three-phase AC driving is used in AC circuits.