Abstract: The quality of Bruguiera gymnorrhiza and Rhizophora stylosa hypocotyl budding and rooting in water of different salinities (expressed relative to normal sea water) was studied in seeds from the Guangxi coast. Seawater salinity lower than 10‰ promoted the budding and rooting of B. gymnorrhiza hypocotyls. Relative to those grown in water with salinity levels higher than 20‰ and 30‰ these began rooting about 6 days earlier and mean rooting was 7.1-4.8 days earlier. Rooting rates were 20%-30%. The best seawater salinity condition for R. stylosa hypocotyl rooting was about 20‰ at which the rooting rate and mean rooting rate were 90% and 68% respectively. The rooting rate was only 40% in freshwater. A novel bimodal phenomenon in the continuous rooting rate of B. gymnorrhiza hypocotyles was also observed. Budding of R. stylosa hypocotyls appears to be limited when their base is exposed to light.