The assembly halls were transferred from Japan to Taiwan during the Japanese Colonial Period. The original goal is to foster the concepts and quality of civic education. The assembly halls were a result in modern society. In 1900, to celebrate the marriage of Prince Taisho, the Japanese in Keelung built an assembly hall in Keelung, which served as the place for gatherings and activities by the Japanese. It is the earliest assembly hall in Taiwan. Assembly halls were mainly used by the Japanese at the beginning. Later, they became the public space for citizens. With urban development in Keelung and the increasing number of population, the assembly hall became too crowded to accommodate the citizens’ activities. Civil assemblies, where major decisions on most Keelung citizens were made, were mostly held at the assembly hall. After Keelung City Hall took over the Aseembly Hall, the public opinions called for expansion of the Aseembly Hall. Owing to the difficult financial condition and the approaching war, the expansion was never made. Even though the assembly hall was the public space for the citizens and played an important role in conveying new culture in the modernization, it was still for colonial cultivation. Besides being the location for colonization policy propaganda and new culture of the Japanese government, Keelung Assembly Hall was also the major public domain of the local people. Influenced by modern culture and the Japanese in Keelung, Taiwanese people in Keelung also intended to establish an assembly hall for the Taiwanese. With the then newspaper, official archives and local journals, the researcher presents the establishment procedures of the assembly hall during the Japanese Colonial Period, and analyzes the diversity and development of the local society in Keelung.