Using plugin development technology, a public meteorological service platform based on the OSGi.NET plugin framework is developed. According to the three functions of modularization and plugin, serviceoriented architecture, and module expansion provided by the OSGi.NET plugin framework, the platform is modularized and divided in the system design in accordance with the functions. In the system, each module is a plugin, independently developed as a standalone project, communicating and interacting with each module through a “service” approach; when a function of the platform needs to be changed without modifying the original plugin codes, a pair of “extension points” and “extensions” based on the XML format to implement a plugin extension to another plugin. The rapid development of the platform is realized, and the problems of reusing and extensibility in practice are solved.