This study explicated the ways that how low temperature and water flooding had directly influenced the growth of mangrove plant Kandelia obovata distributed in Shacheng Bay (27°17'N,120°18'E), Fujian province where latitude is higher than 25°N and discussed the dwarf reasons of mangrove plants in higher latitude. Under the influence of global warming, it can provide the theoretical guidance for mangrove afforestation in higher-latitude areas in China. Through the survey of the growth status of the shoots of Kandelia obovata and the real-time monitoring of temperature under and above the flooded waterline and the tree height at different relative elevation for Kandelia obovata in Shacheng Bay, how low temperature and flooding influenced the growth of Kandelia obovata was studied. The results showed that low temperature had significant effects on Kandelia obovata growth, especially the part above the flooded waterline, mainly displayed in the branches and leaves of Kandelia obovata were strongly subjected to the low temperature stress, growing slowly, the bud withering at the top of crown; there was significant negative correlation between the Kandelia obovata height and the relative elevation; flooding reduced the photosynthetic capacity of Kandelia obovata leaves. To a certain extent, flooding could reduce the low temperature stress impact on the growth of Kandelia obovata and promote the upward growth of Kandelia obovata in higher-latitude area. But under the influence of low temperature and strong tidal range, a tall Kandelia obovata forest could not be built in higher-latitude regions.