Wireshark is an open source, free, powerful and extensible network communication packet capture analysis software, but it has many shortcomings in analyzing SV packets, which limits the use of Wireshark in smart substation. By analyzing the design idea, module architecture, main data structure and processing flow, and the frame structure and coding of SV packet, the design idea and implementation process of Wireshark-based SV packet analysis tool are presented. The operation result of the SV packet analysis tool designed and developed based on this scheme has achieved the intended purpose. The further development based on the open source software Wireshark expands the application scope of Wireshark, and can absorb the essence of open source software. It provides an idea for the application of open source software in power systems and has great significance for understanding the smart substation communication protocol. This work is supported by Science and Technology Project of State Grid Corporation of China “Research and Application of Substation Automation Equipment Wide-area Operation and Maintenance Techniques” (No. 5210EF170027).