日本在明治初期將移民列爲重要國策，有計畫的將日人進行國內外移民，20世紀初到1945年，日本在殖民地的移民尤其顯現其帝國擴張色彩。在日本眾多移民地當中，本文選擇臺灣與滿洲作爲討論對象的原因有下列幾點；1.日本在臺灣的移民事業，爲日本帝國第一次殖民地移民，臺灣的經驗曾作爲其他殖民地的參考。2.日本在滿洲帶有武裝性質的移民，人數之多，分佈之廣，居日本帝國圈之首。3.臺灣與滿洲在日本帝國的大陸政策上，分別具有南進基地與北進基地的重要性。由於兼論日本在滿洲與臺灣的移民範圍過於龐雜，本文聚焦於同屬國策會社的臺灣拓殖株氏會社和滿洲拓植公社，探討移民事業的開展與日本國策的關係，並說明臺拓在南進政策、滿拓在北進政策所扮演的角色，試圖分析國策會社的移民事業與日本帝國擴張的關係。

The policy of the emigration is one of important policy for Japan in the primary of MiZhi. From early 20(superscript th) century to 1945, Japanese government moved Japanese people to oversea step by step and those Japanese in the colony had the color of empire expanding. The reasons which choose Taiwan and Manchuria as the topic in this article are below: The first one is the colonial plan in Taiwan is the first time for Japanese government. This experience can be other reference to Japan government when they want to apply the same policy for other colonies. In Manchuria the large number of Japanese immigrates who have arms is the second reason; the third one is that Taiwan and Manchuria are on the very important positions for Japan in southward advance policy and in northward advance policy. It will be a complex issue to analyze the topic about Japanese migrates in Taiwan and Manchuria, so the topic in this article will put the emphasis on Taiwan Development Company and Manchuria Development Society; both of them belong to national policy companies. Furthermore, the relationship between migrates’ development and Japanese national policy, and the roles of Taiwan Development Company in southward advance policy and Manchuria Development Society in northward advance policy will be discussed. The emigration policy of national policy company as well as the expansion for Japanese Empire policy is also analyzed in this article.