The study of Japanese enterprises and imperial expansion in the light of ＂industry-state co-operation＂ has produced substantial results. In the framework of state planning, private enterprises and private capital had played an advancing role which cannot be under-estimated, particularly the well-known ＂political merchants＂ such as Mitsui, Mitsubishi, Sumitomo, and Furukawa. However, there still existed many other worth-examining Japanese-owned enterprises which possessed close relationships with the development of the Japanese empire. One of these examples is the civil engineering and construction industry which has been overlooked previously but was in fact important. This study focuses on the case of the famous civil engineering firm, Kajimakumi. It investigates how Kajimakumi made preparations for ＂recovery＂ in the midst of the intensification of the control of the Japan Empire after the outbreak of the Second Sino-Japanese War in 1937. This paper clarifies the activities of Kajimakumi not only in the old overseas territories in Korea, Manchuria and Taiwan but also the new overseas territories in North China, Southeast Asia and South Pacific. Moreover, it investigates the ＂industry-state co-operation＂ between Kajimakumi and various government agencies, such as the Ministry of Foreign Affairs, Ministry of Colonial Affairs, the Army, the Navy Office of the Governor-General of Chosen, and Office of the Governor-General of Taiwan, as well as its ＂chain relationships＂ with other big enterprises, such as the old zaibatsu, new zaibatsu, and national policy companies. Through such an analysis, it clarifies the role of Kajimakumi in the structure of imperial expansion in order to delineate the correlation between ＂the state control＂ and ＂the enterprise development＂.