The study of phytoplankton are the subject of great interest becomes phytoplankton is basic link of food chain in an aquatic ecosystem. The abundance of phytoplankton is more of less governed by the interaction of number of physical, chemical and biological process. There are significant in determining the pattern of fluctuation in yield of total plankton. The phytoplankton communities are species of the following groups Chlorophyceae, Bacillariophyceae, Cyanophyceae and Euglenophyceae has been observed in Kasal pond during study periods. A total 24 species belonging to four groups have been identified Chlorophyceae 11 species, Bacillariophyceae 8 species, Cyanophyceae 4 species and Euglenophyceae 1 species. The population density of phytoplankton varies from month to month and recorded maximum density 613 No./lit in the month of January and minimum density 189 No./lit in the month of August. The diversity of the different of phytoplankton in more winter seasons than summer and raining seasons.