Pulicat Lake constitutes a unique and interesting fragile ecosystem in Coromandal coastal zone in South East coast of India. Lake serve as a nursery and breeding ground for many species of aquatic flora & fauna and nesting ground for several species of native & migratory birds. Physico-chemical parameters are the important indicators of environmental degradation like Temp. Salinity, pH, Turbidity, DO, BOD, COD, Total Alkalinity, Total Hardness, Ca, Mg, Nitrate, Phosphate, Carbonate and Bicarbonate, which are essential for ecological balancing and supporting growth of many aquatic organisms. The water samples were collected on monthly basis using small outboard engine motor by reaching particular habitat sits/location of Bursatella leachii species were earlier it found, since sudden out break and sudden disappearance of B. leachii has been noticed worldwide. It was made an attempt to co-relate the availability of B. leachii with Physico-chemical parametrs. In the present study it has been observed that the physico-chemical condition requires for the species Bursatella leachii present in the Pulicat lake. Lake is not affected by the sea water as there are sand bars and shoals in the eastern side of the Lake.