To explore the appropriate salinity and appropriate region of Sesuvium portulacastrum growth, the growth and chlorophyll fluorescence parameters were measured simulated artificial ecological floating bed for hydroponics in constant temperature incubator. The results showed that the growth of S. portulacastrum was well at 0-15‰ salinity conditions, and seawater with 10‰ salinity promoted its growth. The relative growth rate and fluorescence parameters were inhibited when the salinity was 5‰ and above 20‰. The light energy utilization and electron transfer efficiency of S. portulacastrum decreased under salt stress, and regulatory energy dissipation increased, thus affecting photosynthesis. When salinity reached 30‰, S. portulacastrum death finally. Therefore, S. portulacastrum had a good potential for ecological restoration and marine vegetables development at the appropriate temperature, the salinity of 0-15‰ water area could be the restoration application area, while 10‰ salinity could promote its growth and cultivation of marine vegetables.