Abstract: Dajiuhu Wetland is the birthplace of the first tributary of the Hanjiang River. It contains a variety of wetland types and has important biodiversity protection and potential scientific research and ecotourism value. In order to evaluate the status of plankton and water quality in Dajiuhu region, the water quality and plankton of the nine sub-lakes under its jurisdiction were sampled in 2015 and 2016. The results showed that a total of 129 species of 48 genera of 8 phylum phytoplankton and 36 species of 3 genera and 2 phylum of zooplankton were found in the nine sub-lakes; The highest average zooplankton abundance is Lake five and the highest average plant abundance index is Lake nine; Compared with the sampling results of six time periods, the water quality index for certain time periods in 2015 fluctuates significantly compared with the 2016 index and is highly eutrophication, It tends to be stable at Lake 9 and flows into the water hole at a relatively low value. The mean values of total phosphorus(TP), total nitrogen(TN), and biochemical oxygen demand(CODMn) were 0.032, 0.632, and 4.5 mg/L, The research results can be used as a reference for water environmental protection and ecological repair of the Dajiu Lake Wetland basis.