The seasonal dynamics of the crustacean zooplankton community in Lake Linhuan were investigated from March 2017 to February 2018. A total of 13 species were recorded, including 8 species (8 genera) from Cladocera and 5 species (5 genera) from Copepoda. The eutrophic species Diaphanosoma brachyurum, Bosmina sp., and Mesocyclops leuckarti were the dominant species during the warm season, whereas Cyclops vicinus was the dominant species during winter. The large-sized Daphnia galeata was observed infrequently. The annual mean density and biomass of crustacean zooplankton were 28.3 ind/L and 0.33 mg/L, respectively. The annual mean trophic state index (TSI_M) was 62.6. The average yearly values of Shannon-Weiner index, Pielou index, and Simpson index of crustacean zooplankton were 0.86, 0.74, and 0.49, respectively, and there were significant seasonal differences in these indices. The nutrient levels, TSI_M, and species diversity index indicated that Lake Linhuan was affected by eutrophication. Redundancy analysis revealed that water temperature, total phosphorus concentration, and chlorophyll a concentration were the bottom-up factors affecting the community structure of crustacean zooplankton. The predation pressure from Hypophthalmichthys molitrix and Aristichthys nobilis was the top-down factor affecting the miniaturization of crustacean zooplankton community.