Overseas activities of Taiwanese under Japanese colonial rule constitute an important part of Taiwan's history. Researches made so far were mainly about Taiwanese residing in southeast China, Chongqing, and Manchuria. Little effort has been made on studying lives of Taiwanese in Beijing. During the eight years of Japanese occupation (1937-1947), there were about 500 Taiwanese living in Beijing (北京). This essay explained why they were there, what occupations were they engaged in, and what happened to them after the war. Materials reviewed in this study included travel certificates of Taiwanese kept by the diplomatic record office of the Ministry of Foreign Affairs of Japan, annual statistics on overseas travel of Japanese (including Taiwanese and Korean) compiled by the Japanese government, as well as diaries, novels, articles and oral history written and narrated by Taiwanese concerning their experiences in Beijing between 1937 and 1945.