As the biggest local lake, Dianshan Lake plays an important role in fishery, aquatic food supply and conservation for aquatic living resources for Shanghai. In this study, we analyzed the annual variations on diversity of fish community and its status of this lake based on the survey data in Dianshan Lake from 2010 to 2012. The results showed that fish species composition was similar among the three years and the dominant species tended to be mini type fish of fish composition. It indicated that the Diversity Indices of fish community in Dianshan Lake were not significantly different among the three years (P>0.05). Moreover, the analysis of k dominance curves showed that the fish community was disturbed in Dianshan Lake in the three years. It is necessary to adjust management rules to maintain fisheries resources by improving water quality, relieving the fishing intensity, and improving fish stock enhancement in this lake.