This essay takes Yuan Region, in the northeastern Taiwan, as an example to show how western acting style formed and developed in Taiwan by discussing the development of “cultural drama” produced by Taiwan Culture Association, child's play performed in schools' matinees and “youth drama” made by the Youth Group (Seinendan). The development of “cultural drama” had to do with the wish that members of Taiwan Culture Association had to cultivate the intelligence of the general public. However, owing to the personnel and financial problems, “Minfong Troupe” (1928) and “Xinmin Troupe” (1932) once existing in Yilan were both disbanded soon after they had been set up. The development of child's play in Taiwan had to do with the new education movement in Japan due to the Renovation during the Meiji Period. The content of the performances given by children in common schools and Japanese schools included western and Japanese fables, fairy tales, songs and stories of great people adapted from what were taught in class, whose themes ranged from cultivating children's virtues to emphasizing the value of sacrificing oneself for the country. At the early stage, "youth drama” focused on getting rid of superstitions, promoting political orders and promoting the Japanese language. With the passing of the Kominka movement, “youth drama” was transformed as the “Theatre volunteer corps” (Engeki tenshin tai), promoting militarism. In performing activities of child's play, “youth drama” and "Theatre volunteer corps” supervised directly by the Japanese government, we can find the Japanese government making use of dramatic performances to console injured soldiers and family members of deceased soldiers and at the same time to encourage people to continue their loyalty to the emperor. The popularity of western acting style is due to the fact that people received new school education in Taiwan, or studied in Japan or Mainland China. Gradually, the general public considered people attending “spoken drama” better educated than those attending “traditional theatre”. As a result, Taiwanese people started their prejudice against “traditional theatre” as lower than “spoken drama”. After the year 1950, western acting styles, though still in great use, were adopted to promote the anti-communism and anti-Russia policy; because of the changed political situation, few people dared admit that they had joined the Youth Group or “Theatre volunteer corps”. Consequently, the history of this period remained obscure.