This chapter lays out both the eugenicists' representation and their involvement in implementation of the State's policy of consolidation into a single aggregate unit of evolution in China and Japan. It centers on the interaction of the Sino-Japanese War and population policies, and their effects on the development of the eugenics movements in Japan and China. The chapter analyzes the Japanese and Chinese eugenicists' involvement in the population policies as war strategy, which were the embodiments of their conception of an ethnic nation and racial body. It concludes with the postwar reflections of two eugenicists, Nagai Hisomu and Pan Guangdan, on the outcome of the War. In Japan, the title of the National Eugenics Bill was changed into the Eugenics Protective Bill in 1948. In China, since the domestic turmoil of the civil war and the Nationalist regime's relocation to Taiwan in 1949, the implementation and legal enforcement of the Guideline of National Population Policy was disrupted.