廠商國際化與產品多角化程度對績效的影響有其重要性，然而過去的研究多著重於已開發國家，並針對大型多國籍企業之整體績效進行探討。本研究以經濟部統計處所進行的中華民國89年與91年製造業對外投資實況調查為樣本，分別由母公司與子公司角度著眼，探討國際化與產品多角化程度對台灣製造廠商於大陸投資之子公司以及台灣母公司本身績效之影響。 實證結果顯示：子公司之資源對其國際化和產品多角化程度均有正向影響，而國際化與產品多角化對於子公司績效亦分別具正向影響；母公司資源與國際化程度、水平相關的產品多角化程度均具有正向關係，而水平相關的產品多角化程度對於母公司績效亦存在正向影響。亦即，無論由母公司和子公司的角度切入，資源多寡有助於企業從事進一步的國際化和產品多角化策略，而藉由上述兩種成長策略之採行，對於公司的績效亦有提昇之效。惟母公司資源於89年資料分析中，對國際化程度呈現負向影響；而母公司國際化程度對績效也顯示為負向關係，本文研判原因應為實務界的運作中，國際化程度越高的企業越具有操弄績效的便利性，而國際化的指標選擇受限於次級資料之問卷設計，均對上述模型之統計結果有所誤導，相關探討請詳見本論文。此外，針對國際化與產品多角化影響績效之交互效果的分析顯示，產品多角化對於國際化與績效間正向關係的干擾效果不顯著，亦即廠商進行產品多角化策略對於國際化和績效間的正向效果無顯著助益。 / There seems to be a paucity of research regarding the interrelationships among internationalization, product diversification and performance, especially on the level of subsidiary. Additionally, past studies mostly described the results of firms from DCs. This research is designed to fill these voids. Based on literature on international business and strategic management, this study examines the relationships of performance with internationalization, product diversification and their interaction on Taiwanese manufacturing firms in 1999 and 2001. The data were from the “Survey of Foreign Direct Investment by Taiwanese Manufacturing Firms” conducted by the Statistics Department of the Ministry of Economic Affairs, R.O.C., annually. The empirical results showed that：(1) A Taiwanese firm with more than 200 employees tends to engage in internationalization more likely, and is able to exercise higher degree of corporate horizontally related international product diversification (2) A Taiwanese firm with more than 200 employees outperforms those with fewer employees. (3) Subsidiaries with more than 200 employees tend to have more internationalization and product diversification activities, and tend to outperform those with fewer employees. (4) Internationalization and product diversification at the subsidiary level are positively related to subsidiary performance. (5) Horizontally related international product diversification at the corporate level is positively related to corporate performance. However, the results did not show that internationalization at the corporate level is positively related to corporate performance. Besides, it did not support that product diversifications at both the corporate and subsidiary levels contribute significantly to the relationship between internationalization and performance. In other words, one type of growth strategy (i.e., product diversification) does not significantly change the relationship between another type of growth strategy (i.e., internationalization) and performance.