This thesis describes in detail the design and implementation of the system software in vector network analyzer ( vna ), which mainly consists of the requirement analysis of the system software, the software structure analysis and detailed design, the key techniques utilized in the software design, the s-parameter algorithm as the core technique in vna, and software testing 论文详细介绍了矢量网络分析仪系统软件的设计及实现,主要内容包括系统软件的需求分析、总体软件结构设计以及详细设计、软件设计中的关键技术、矢量网络分析仪的技术核心s参数算法、校准补偿以及软件测试等。