The present paper reports observation on the Cyanophyceaen algalflora of the Tapi river collected from different depths of Prakasha barrage, Shahada Taluka, Nandurbar district, Maharashtra and monthly changes in physical and chemical parameters such as pH, water, temperature, BOD, COD, D.O., T.D.S.,Ca, Mg, Al, Na,K,NO_3, PO_4, SO₄, Cl. In the present study, the results showed as in the aquatic forms are dominated by Cyanophyta members. Total 87 Species are reported. Which belong to class Cyanophyceae. Most domintant species areSpirulina, Oscillatoria, Phormidium, Lyngbya, Nostoc, Anabaena. They are analyzed for a period of one year from Oct 2011 to Sept 2012. All parameter are with the permissible limts. The results indicate that water is non polluted and can be used for Domestic purpose and Irrigation.