With the transformation of social structure and government functions，lots of urban community service stations are growing up to undertake the functions of the government and provide professional service. To study the development of professional social work intervention in urban service stations，the author takes H Community Service Station of Zhongguancun Street in Haidian district in Beijing for example，combining with in-depth interview，participant observation and telephone investigation method. The study finds that most community service stations on Zhongguancun Street in Haidian district emphasizes public service and administration overly while neglects the commonweal service and the service to facilitate citizens so that it is hard for professional social work to bring advantages into full play. Among several reasons，no independent authority，insufficient work site，the serious loss of professional social workers and the lack of effective incentive mechanism of volunteer management are the most important ones.