With the progresses of open source concept, open source software has become the trend of software development, and the use of open source software is subject to various open source licenses. How open source participants can correctly choose open source software licenses in their development to ensure the efficient and reasonable use of the collaborative results of community groups is still an urgent issue to be solved. To this end, commonly used open source licenses are firstly analyzed and interpreted for OSI certification in the paper. Furthermore, with the studies of the license terms and structure, the open source license framework, and compatibility derivation models are deduced. The model is applied to the analysis and interpretation of Mulan permissive software license independently developed in China. Finally, based on the above work, a license choosing tool for open source license is developed, which provides references and decision support for open source developers to understand and use licenses.