This research aims to explain how the government-dominated Taiwan Sports Association (TSA) established the administrative operation system of Taiwan Baseball in Japanese Occupation Period. TSA was founded to deal with overall physical education and sports games in Taiwan, and to communicate with international communities. TSA also assisted in establishing Taiwan's sports administration system by creating a competition system and playing a role as an authority of arbitration. Therefore, the establishment of TSA in the 1920s had a symbolic meaning in domestic integrations as well as incorporations into the Japanese government. TSA was sponsored and inevitably directed by the government. Meanwhile, through its branches in states and provinces in Taiwan, the TSA furthered baseball into local community, and eventually constituted a basic structure to promote Taiwan Baseball in Japanese Occupation Period.