Food ration has always been a crucial role in deciding the outcome of a war. In 1910, the Japanese Government has drawn up a long-term policy on food provisions in case the outbreak of the Second World War. However, as it happended, Japanese Government was unable to obtain the food supply from its colonies at will. In 1939, having full confidence in the intersupport system of Asian grain resources, Japanese occupied Government in Taiwan ceased the free trade and controlled the price of rice for exportation. At the same time, the policy of rice purchase and allocation was carried out. However, these policies caused the deterioration on the rice production. After the outbreak of the Pacific War, Japanese occupied Government continued to merge and integrate rice manufacturers to aggrandize the control of rice circulation. It utilized their processing and storing capabilities and avoiding hostile competition. Though declined, however, a certain growth of rice production was still maintained in Taiwan. Due to the bombard and blockade by the U.S. Army, the transportation of rice to Japan was inhibited thus was kept behind. In addition, based on the systematic allocation of Japanese occupied Government, the social disorder that might have resulted from the disequilibrium between the demand and supply of food provisions never happened in Taiwan. Because of the unified control policy during the war, many manufactures closed down on account of losing their processing equipments. The policy of distribution of the rice purchase as well as the regulation of the rice price prevented the merchants from monopolize the rice market and proceeding with usurious bargains or gambling games. A comparatively active history of rice circulation thereby ended during the war.