Abstract: By using the integral regression analysis method,the relationship between maize yield and eco-climate factors during 1971 and 2000 in Shanxi Province was analyzed.The result showed that the impacts of temperature and precipitation on maize yield per unit were bigger than that of the sunshine,while the eco-climate had bigger impacts on maize yields in the North Shanxi Province than that in the Middle and South Shanxi Province.For the spring maize,the precipitation had positive impacts on maize yields during seeding period,while the temperature and precipitation had positive impacts on maize yields during jointing and heading stage.The sunshine hours were more than maize needs,and had negative impacts on maize yields in the whole stage of maize.The abundand radiation resource showed a great potential for solar energy utilization of maize production in Shanxi Province.For summer maize,the temperature had negative impacts on maize yields during heading and flowering stage,while the precipitation had negative impacts on maize yields in Yuncheng during jointing and ripening stage,especially cloudy and rainy weather in ripening stage.The study revealed that the impact of ecological climatic factors on maize growing in the different growth stages,and could provide scientific references for making full use of eco-climatic resources in Shanxi Province.

Key words: Maize yield, Maize yield, Eco-climate factors, Integral regression