Zooplanktons are the microscopic unicellular and free swimming animalcules which are known as primary consumer as it feed on Phytoplankton. Its composition is controlled by change in existing environmental conditions. Light and temperature are the major factors which influence the density and diversity of the zooplankton in time and space and of the environmental conditions are considered as fundamental for any limnological parameter of the natural waters. Sample surveys of community structure of Zooplankton were conducted from April 2016 to March 2017 in Kawar lake (Begusarai, Bihar) and Goga beel (Katihar, Bihar). During investigation among 26 species of Zooplankton belonging 6 species of Protozoa, 10 species of Rotifera, 3 species of Copepoda, 6 species of Cladocera and 2 species of Ostracoda from Kawar lake and 27 species of Zooplankton belonging 6 species of Protozoa, 11 species of Rotifera, 6 species of Copepoda, 6 species of Cladocera and only one species of Ostracoda from Goga beel were recorded. Our present study deals with community structure, standing stock and percentage composition of zooplankton of Kawar lake (Begusarai) and Goga beel (Katihar) in 2017.