We studied the effects of different temperatures, light intensity and salinity on the specific growth rate, dry weight, ture, light intensity and salinity all had a significant effect on growth, photosynthetic pigment content, and photosynthetic oxygen evolution. The most suitable salinity 20?0, respectively. The optimal growth temperature and salinity was 20℃ and 30 the temperature was above 25℃, or the light intensity was higher than 200 μmol穖 ^{was less than 10 or higher than 50, the blades would Sargassum vachellianum could accumulate more photosynthetic pigment when the temperature was between 10?0℃ or the light intensity was at 20?0or the salinity was at 20?0. When , and salinity 30, photosynthetic oxygen evolution from the blades was highest, about 258.50 μmol穖g. Compared with the lower light intensity, the higher light intensity inhibited photosynthetic oxygen evolution. The results provide a theoretical basis for cultivation and restoration of}