Abstract In order to explore the characteristics of lake water environment ecosystem in Chagan lake, Jilin province, we investigated and analyzed the changes and rules of species and density of lake organisms in October(winter), April (spring), July (summer) and September (autumn) from 2017 to 2018. The survey included phytoplankton, zooplankton and benthos. The results showed that there are 74 species of phytoplankton in Chagan lake, belonging to 8 phyla and 61 genera. Scenedesmus is dominant in summer and Chlorella is dominant in winter. There are 29 species of zooplankton, belonging to 17 genera, 12 species of benthic fauna, and the species of benthic fauna are few in the middle of the Chagan Lake, only Limnodrilus.
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