Based on the daily meteorological data of 90 stations for the period 1971 to 2000 and daily 0.25° * 0.25° gridded meteorological data under the A1B climate scenario (19512070) extracted from the regional climate model RegCM3 released by the National Climate Center,a temperature suitability and coefficient of variation(CV) model for the Huang-Huai-Hai region was built,combing with the growth demand of summer maize for temperature. The spatial and temporal variations of thermal resources,summer maize temperature suitability and its CV in the Huang-Huai-Hai region for the period 19512070 were analyzed. The Huang-Huai-Hai area has distinct dry and wet seasons. The heat resources are particularly important for the growth of summer maize. The analysis of this region in this paper,against the background of climate change,is aimed at improving the efficiency of the utilization of climate resources,and providing a scientific basis for summer maize planting.