面臨資訊科技快速發展與全球化的來臨，現今全業已邁入知識經濟時代。所以，唯有知識才是個人及整體經濟的主要資源。因此，知識將是未來企業致勝的利器。在實務上，組織內的員工愈積極分享知識，愈能發揮知識的價值。本研究採用研究人類行為意圖最為廣泛接受的理論：計劃行為理論為研究模式中的基礎理論，並且回顧過去知識管理與知識分享的相關文獻，共找出九項外生變數並以探討與態度、主觀規範及認知行為控制之問的影響關係。 本研究使用結構化方程式模式的分析技術，對於研究架構進行驗證，其研究結果為影響態度的外生變數有期望關係、期望損失、利他主義、與工作任務相互依賴。影響主觀規範的外生變數有情感型信任與工作任務相互依賴。影響認知行為控制的外生變數有個人資源充裕度。在計劃行為理論模式中的內生變數間影響關係，僅有主觀規範影響意圖這條因果關係是不存在的，其餘的因果關係皆是成立。最後，本研究結果期望在學術與實務方面，可做為後續知識分享研究的參考與建議。

With the fast developing information technology and globalization, businesses are entering into the age of knowledge economics; accordingly, the production and use of knowledge become major challenges for business. In practices, to multiply the knowledge value, business have to advocate the concept of knowledge sharing since the more knowledge the employees share, the more worth the business have. In this study, we propose a model of knowledge sharing based on the Theory of Planned Behavior (TPB) to study how the IS personnel behave in their respective practices concerning knowledge sharing. Also, through reviewing of knowledge management and knowledge sharing literature, we have identified several antecedents contributing to knowledge sharing behavior and those affecting attitude, subjective norm, and perceived behavioral control. In validating our research model with Structure Equation Modeling, our data supported all the individual causal paths postulated by TPB except the relationship between subjective norm and knowledge sharing intention. The antecedents such as expected associations, expected loss, altruism, and task interdependence contributed significantly to the attitude toward knowledge sharing; the affect-based trust and task interdependence significantly impacted on the subjective norm; finally, the resources fit significantly influenced on the perceived behavioral control. The result will be useful to both the academic and business in their advocacy of the conducts of knowledge sharing.