As the important grain production region in China,the Huang - Huai - Hai plain faces great challenges on grain productivity under climate warming. Therefore,this research would employ spatial econometric model to empirically investigate impacts of climate change on maize and wheat productivity in the Huang - Huai - Hai plain. The main results of this study show that there exists a significant inverted - U relationship between temperature and wheat yield; the linkups between precipitation and maize yield and wheat yield are also an inverted - U relationship at significant level,respectively; fertilizer input,mechanical input and technology progress have significant and positive impacts on maize yield and wheat yield,respectively under climate changes.