Abstract: On basis of linear regression and correlation analysis, the relation between the yield per unit of summer corn and meteorological factor are comprehensive analyzed according to 40 years data from 1970 to 2009. The results indicate: the meteorological wave index of summer corn is 0.139, which hold the 35.51% in the coefficient of variation (0.3914) on actual output, and weather factor are the principal impact factor of summer corn output. The wave of summer corn output are mainly influenced by the rainfall in the middle ten days of June and the last ten days of August, and the temperature in the last ten days of August and the first ten days of September, as well as the sun hours in the first ten days of July and August. Some phenomenon need to be paid attention to such as the drought in the sowing time in the first and middle ten days of June, and in the shooting period in the first ten days of July, as well as the waterlog in the pollination period of flowering in the first ten days of August.