In order to investigate the change and evolution of fish community structure in Jinze Reservoir from 2017 to 2022， Margalef richness index， Shannon diversity index， Pielou evenness index， abundance biomass curvilinear method， completeness index， and clustering analysis were used to investigate and analyze the fish community.The results showed：A total of 5 119 fish were collected in the survey， belonging to 7 orders， 12 families， 34 genera， and 46 species. The dominant species in Jinze Reservoir in the 2017 survey were Coilia nasus， Pseudorasbora parva， Hypophthalmichthys molitrix， Aristichys nobilis， Carassius auratus，and the dominant species in Jinze Reservoir in 2018-2022 were Coilia nasus， Hypophthalmichthys molitrix， Aristichys nobilis and Carassius auratus.After clustering analysis： at the level of 70% similarity， 2017， 2018， and 2019 were separate groups， and 2020， 2021， and 2022 were groups， and the fish communities were similar in the last three years. The fish Margalef richness index and Shannon diversity index in Jinze Reservoir from 2017 to 2022 were overall high and showed an upward trend in fluctuation； the Pielou evenness index declined and then stabilized， and the competitive advantages of the dominant species gradually appeared. The fish integrity index evaluated the Jinze Reservoir as "fair" in 2017 and "good" in the remaining years. The biomass of population abundance method showed that the biomass of abundance curves of Jinze Reservoir from 2017 to 2022 did not cross and the statistic W was greater than 0， which indicated that the structure of the fish community was stable. The study showed that the fish diversity in Jinze Reservoir was getting higher from 2017 to 2022， the community structure was not negatively affected， and the ecosystem remained stable.This study can provide a reference for the management of fish resources in the reservoir and the construction of an ecological reservoir.