Abstract: In order to investigate the effects of waterlogging stress on Spartina alterniflora growth,five levels of waterlogging time treatment (2,4,6,12 and 24 h/d) and three levels of waterlogging depth treatment (0,10 and 20 cm) were configured.S.alterniflora seedlings with 7-10 cm height were cultivated for experimentation.Responses of growth index,tiller number and aboveground biomass were determined over the course of four months.The results showed that:(1) There was extremely significant differences among the waterlogging depth treatments 0,10 and 20 cm (P<0.01).Tiller number and aboveground biomass decreased significantly with increased waterlogging depth.(2) There was extremely significant differences among waterlogging time treatments (P<0.01).Tiller number and aboveground biomass decreased along with increased waterlogging time,and all plants with 20 cm water depth and 24 h/d waterlogging died. (3) With waterlogging stress,S.alterniflora growth responded with the order of plant height coefficient > leaves correlation coefficient > asexual reproduction coefficient.Thus,persistent waterlogging treatment is an effective physical measure to control S.alterniflora growth.