At present,the traffic management of the switches at the smart substation process level mainly adopts VLAN division method.Need to understand the working principle of VLAN and design artificially by information flow,so efficiency is not high.By analyzing the SPCD and SCD,the port topological relations of the switches are established,and the information flow of each intelligent electronic device (IED) device in the switch is analyzed,and the port VLAN ID is automatically assigned according to the ports (PVID) to auto-complete the generation of VLAN configuration tables in the switch.An automatically generated test case of 220 kV typical interval VLAN configuration table is designed.The test proves that this method can automatically generate the VLAN configuration table of intelligent station switch and control the flow direction according to the expected refinement,greatly improving the working efficiency of the site,has a certain practical value.