After the incident of 18 th September in 1931,Japan planted large quantity of opium in the occupied areas of China by importing opium to China step by step,and the Mengjiang district was compelled to plant the opium poppy in large areas around 1936.From 1939 to 1945 the Japanese army and their puppet regime adjusted the opium policy,carried out the check system and the “big opium policy”,all of these caused the opium narcotic drugs to overflow in Mengjiang district.
William O. Walker Ⅲ.Opium and For eign Policy: The Anglo-American Search for Order in Asia, 1912-1954. Chapel Hill: University of North Carolina Press, 1991. xvi +346 pp. Notes, bibliography, maps, index.