Secondary development technology can help realize adaptation of 3D CAD softwares to China‘s national standards i. e. GB, industrial or manufactures‘standards, as well as functionality extension and development of professional module. This paper elaborates the secondary develoqment of SolidWorks through the host-add-in method. The standardized design module of gas cooler is developed, and is embedded into the SolidWorks as a functional add-in, just like other functions owned by SolidWorks itself. The technology can help develop custom design modules, which contain professional knowledge, design process rules and user data. Also, such modules can be integrated into SolidWorks seamlessly, improving the design productivity and competiveness.%通过二次开发技术可实现三维CAD软件对不同行业和标准(国标、行标、厂标等)的适应匹配，以及软件的功能扩展和专业化模块定制等。论文介绍了采用宿主程序法进行SolidWorks二次开发的技术，开发了气体冷却器标准化设计功能模块，并以用户插件的方式嵌入了SolidWorks主程序界面中，如同SolidWorks自带功能。该技术可以帮助用户建立具有自己专业知识、流程规范和数据积累的专有设计功能模块，并无缝集成到SolidWorks程序中，提高设计生产力和竞争力。
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