A present study deals with the effect of exogenous addition of sodium chloride ranging from 0-800mM NaCl on growth and photosynthetic characteristics of Bruguiera conjugata and Ceriops roxburghiana. The growth parameters such as shoot length, root length, fresh weight, dry weight increased upto optimum level of 400mM NaCl in B. conjugata and 300mM NaCl in C. roxburghiana. The chlorophyll content and net photosynthetic rate increased upto optimum level, beyond this level drastically reduced the net photosynthetic rate. The increase in the net photosynthetic rate was associate with the increasing chlorophyll content of both species.