How to authentically evaluate the contribution of developers and distinguish the core developers and the peripheral developers in the open source software is an important research question. Based on the analysis of 9 Apache projects, the developers' contribution to the project can be analyzed by designing the contribution allocation algorithm for project files, which also contributes to effectively distinguish the core developers and the peripheral developers. The feasibility and accuracy of the proposed algorithm are verified by checking the list of official developers' regions and comparing different traditional evaluation schemes on the similarity of the real list. Finally, the classification model of the support vector machine is established, and the accuracy of the developer classification is improved by combining the key factors that affect the role of the developers.