Abstract: Based on different cultivating ways of rice,the biological traits of stubbing and fructifying for subaqueous red sprangletop were investigated and researched. Some morphological difference between the subaqueous red sprangletop and the dryland-living one,such as their plant heights,stem tiller nodes,stolons,stolon tiller nodes,tassel lengths,tassel branches,followers per tassel,weights of thousand-grain and so on,in the rice fields with transplanting,seedling-broadcasting and direct-seeding ways were distinguished clearly.