知识共享有助于群体绩效水平的提高，然而对于拥有不同知识位势的个体而言，其绩效水平的高低却取决于知识共享的机制。本文分析了影响群体知识共享的相关因素，并建立多主体模型，动态模拟了不同的知识共享机制对群体绩效以及对个体加入群体的影响。研究表明，知识共享行为主要受个体预期的成本收益等因素的影响，构建科学合理的知识共享机制可以降低知识共享成本，维持个体之间的利益平衡，提高群体绩效。

Knowledge-sharing is beneficial to improve group performance. However, to the individuals possessing different knowledge potential, their own performance relies on the knowledge-sharing mechanism. Firstly the related factors which have influence on the knowledge-sharing are analyzed. Then a model is built to simulate the impact of knowledge-sharing mechanism against the group performance and individual’s joining the organization in dynamic scene. The result implies that behavior of knowledge sharing is mainly under the influence of the balance between anticipated benefit and cost of individuals, and so on. The construction of more scientific and proper knowledge-sharing mechanism can decrease the cost of knowledge sharing, keep up the balance between the interests of individuals, and improve the group performance.