The technology is changing fast in current business environment, today¡¦s success maybe will be gone by tomorrow. Therefore, the organization needs to keep learning and innovating to survive. To become a willing sharing and creation organization, the firm needs to gather all the knowledge in department, group and each employee. The key success of knowledge sharning is the employee¡¦s willingness of sharning knowledge. The knowledge is created through people¡¦s interation and the knowledge sharing is built on people¡¦s relation. The purpose of this rearch is to explor the employee¡¦s knowledge sharing willingness through social network approach. In the other hand, the psychological ownership could bring positive work attitude. Therefore the moderating effect of psychological ownership to social network and knowledge sharing willingness will be discussed as well. The target groups of this study are production or technology related departments of high technology companies. The samples are engineers, deputy engineers and supervisors. The total valid samples are 7 companies, 13 departments and 159 employees. Research method includes social network analysis software Ucinet and Hierarchical Regression Analysis. The result shows psychological ownership could raise the engineers¡¦ knowledge sharing willingness and moderate the relationship between in-degree centrality of advice network and knowledge sharing willingness. The findings are as follows: 1. Network degree centrality of internal advice network does not affect knowledge sharing willingness. 2. Psychological ownership positively and significantly affected knowledge sharing willingness. 3. Psychological ownership as the moderator positively and significantly affected the network degree centrality of internal advice network and knowledge sharing willingness partially.

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