Abstract: The water supply and demand amount in summer maize growth period was set as drought and waterlogging evaluation index of summer maize. Using the methods of GIS， statistics and agrometeorology， the precipitation cases in the summer maize growth period in Liaochen district from 1961 to 2011 were systematically analyzed. Through the calculation of Palmer drought severity index， it was found that drought and waterlogging frequently occurred in the summer maize growth stage， in which drought played the main role. The occurrence frequency of drought achieved 804% in seedling stage， and the phenomenon of the critical drought easily happened， which seriously influenced the normal growth of summer maize. With global warming， the drought showed increase trend year by year， which would give rise to the trouble for the district sustainable development of summer maize. The main measures on dealing with drought and waterlogging were as followes: strengthening the construction of infrastructure， organizing the research and application of cultivation technique under stresses， promoting water saving technology， using the air and groundwater resources well and guaranteeing the cultural water in the critical period of summer maize growth．

Key words: summer maize, drought and waterlogging, characteristics, Liaocheng of Shandong Province