Abstract: Partition of the main switch in the topology of secondary security protection device based on VLAN technology is done in the dispatching master station. A debugging and training platform for secondary security devices is built. The reliability and practicability of the training platform are verified by debugging the forward isolation device and the longitudinal encryption authentication device. The debugging and training platform of secondary security devices based on VLAN technology can save the cost and area comparing with the topological structure of traditional facility. Operators can study and apply VLAN partition, equipment debugging and so on.