Maize is an important food crop and the Huang-Huaihai summer maize region is the largest corn-producing area in China. Based on daily 0.25 x 0.25 degree grid meteorological data under an A IB climate scenario (1951-2100) extracted from the regional climate model RegCM3 and 1971-2000 daily meteorological data for the Huang-Huaihai region, summer maize climate suitability modeling across the whole growth period was contrasted and combined with temperature,precipitation and sunshine. Our aim was to provide a theoretical basis for the rational development and utilization of climate resources and adjusting the layout of agricultural production. The temporal and spatial variation characteristics of summer maize climate suitability in Huang-Huaihai from 1951-2100 were analyzed. We found that the climate suitability of summer maize from 1951 to 2100 followed a downward trend. During 1951 to 2010,summer maize climate suitability was mostly higher than 0.8 with southern Hebei, eastern Henan and western Shandong increasing slightly. It begins to decline 2011-2040 to 0.65?0.75,and then decreases fiercely to 0.45?0.5 from 2071-2100. The jointing-tasseling and heading-maturity stages were more sensitive to moisture and temperature compared to other growing-stages. From 1951-2100, the temperature and precipitation suitability degree on summer maize jointing-tasseling and heading-maturity stages both declined drastically, while that for the sowing-emergence and emergence-jointing stages changed slightly. The precipitation suitability degree and temperature suitability degree during these two developmental periods were the main drivers of the decline in summer maize climate suitability.