Abstract: The endurance of summer maize to floods and the impacts of the floods to maize yields and its components were studied through the experiment of different flood depth and time for summer maize in the jointing stage and tasseling stage.The results showed that flood had obvious impacts on the maize density,maize greenery,ear lengthen and thick,and the yields,but not on the development process and one hundred grains weight.It was no gains if flood continued more than 5days in jointing stage or more than 7days during tasseling stage.The endurance of younger maizes was weaker than old ones.

Key words: Summer maize, Summer maize, Flood disaster, Experiment