About 48 cyanobacterial stains were isolated from pasture land; pound and paddy fields of different locality of Bilaspur district which was divided into ten sectors for two successive years and strains were identified as Nitrogen fixer and non-nitrogen fixer. It was interesting to note that there is reoccurrence of cyanobacterial flora throughout the year in a rhythmic way. The thallus organization of non - nitrogen fixture shows rich biodiversity from unicellular to filamentous through colonial form, while nitrogen fixer never seen in unicellular organization rather they are prevalent in colonial and filament form.