Abstract: In order to investigate the response of mangrove plant to fresh water logging stress, Aegiceras corniculatum seedlings were cultivated in fresh water in Meizhou, Guangdong for 1 year to investigate the effect of different fresh water-logging levels on their physio-ecological characteristics. The 5 water depths were: 0, 1/4, 2/4, 3/4 and 4/4, respectively. Results showed that: the 0, 1/4 and 2/4 groups had significant higher survival rate, height, stem diameter, branch number, leaf number, leaf area, root number, root length and root diameter than those of the 3/4 and 4/4 groups; the height increase showed a trend of 2/4＞1/4＞0＞3/4＞4/4, and the stem diameter increased a trend of 1/4>2/4>0>3/4>4/4; the biomass of the 0, 1/4 and 2/4 groups also were significantly higher than those of the 3/4 and 4/4 groups; SOD and POD activities in leaf and root increased significantly as water depth reached 2/4 and higher; the chlorophyll content, root activity and soluble sugar of the 0, 1/4 and 2/4 groups were significantly higher than those of the 3/4 and 4/4 groups, with a trend of decreasing with water depth; the seedlings of Aegiceras corniculatum grew well at 3/4 water depth for 270 days, indicating a strong water logging tolerance. The physio-ecological characteristics revealed by this study indicated that Aegiceras corniculatum was suitable for cultivation in shallows of rivers, lakes or reservoirs.