外來投資對地主國貢獻包括資本、技術、管理人才等，本研究主要在探討地主國投資環境的差異對多國籍企業的投資與貿易成長造成的影響。本研究建立以外來投資為自變數，建立銷售成長率與營業利潤率為因變數及地主國投資環境為干擾變數的研究結構與假說，選取代表地主國投資環境之變數項包括經濟環境、政治法令、社會文化、教育。針對55家在台灣與中國大陸皆有子公司之製造業(有效樣本回收率30.5%)進行實證研究。
研究結果顯示，外來投資程度越高，越能提升貿易成長，在交互作用項方面，地主國投資環境越佳，越能強化外來投資對貿易成長之關係。據此，本研究建議地主國應改善投資環境，包含政治法令、經濟環境及教育政策，俾有利外來投資進入增加貿易成長。
The contribution of foreign direct investment to the host country includes capital, technology transferring, and managerial talent. This paper tends to investigate the impact of different host country investment environment to foreign direct investment and increase in trade. Therefore, the structure of this study is foreign direct investment as independent variables, The host country investment environment as a moderator variable affect growth rate of operating income and operating profit rate as dependent variables. The host country investment environment includes politics and law, economy environment, and education. Form the evidence of the main effect, the higher degree of foreign direct investment, the more increase in trade. The better investment environment is valued by growth rate of operating income and operating profit rate is account for. This study makes some recommendations for host country, with improving investment environment includes politics and law, economy environment, and education It can be benefit to foreign direct investment and improve trade as well.
