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One of the most difficult jobs for requirements analysis engineers is to select the appropriate requirements analysis knowledge for the project at hand. Once the selected requirement analysis knowledge does not fit the current project situation, it is doomed that some requirements problems will be emergent and the final system canpsilat fit in with the enterprise needs at a great extent. Requirements analysis knowledge can be shared and reused under similar project situation. A new knowledge reuse method based on project situation similarity is proposed in this paper. Firstly, the tree models or hierarchy models of requirements analysis knowledge situation are presented. Secondly, three situation match schemes are summarized and analyzed with reference to the tree matching, including tree inset, tree inclusion and tree intersection. Further, a quick tree matching algorithm is provided upon these three models. Through the method application, the results show that it is feasible and effective for the improvement of the knowledge reuse quality.