Abstract: More attentions had been given to the impacts of climate change on agroecological environment and crop yield in China. Through analyzing a series of research results in the past 10 years at home and abroad, this paper mainly demonstrates the influences and research methods of the impacts of climate change on the yield of three major food crops, and summarizing the differences among various research methods. At the same time, by analyzing changes on crop yield, this paper points out the existing problems and orientation of development. And it carries out the foundations of agriculture adapting to climate change and sustainable development.