Aquatic systems suitable for variety of primary producers, animals, birds, may native or migratory, fishes and all related biotic and abiotic components. They form different food chains, food web and mineral cycling ways as well as responsible several biological products. Phytoplankton species produce above the half of earth’s primary productivity. Kalvala reservoir located near to mandal Veena vanka of Karimnagar district, Telangana. 50 algal species occurred, 6 from Bacillariophyceae with 12%of total species contribution, 26 species from chlorophyceae, 18 species from class Cyanophyceae. Filamentous forms contribution to 36%. If diatoms species diversity more it can indicate that the water physico-chemical parameters are so good. Due to the urbanization resulted to pollution, which imbalance the ecosystems Phytoplankton species distribution causes disturbance to reregulated aquatic system.