The community development activities have been promoted all corners of Taiwan since 1965. The purpose of it is to raise the community living quality all around. In order to have people in the community participate the activities aggressively and to condense the community consciousness, the community media plays a very important role. Most of the scholars confirm the functions of mass media in the community and agreed with the importance of the public channel in propelling the community development. According to the Article 25 of the Cable TV Law, the cable TV owner shall provide the free channel for governmental offices, schools, organizations and the public to broadcast programs of public welfare, literature and art or social education, which in order to perform access right and to promote the social multi-functional development. This paper is in studying the community functional works of public channel of cable TV, and propose steps in promoting community development thus achieve good result of the promotion of community activities.