Abstract: This article used The Grey Relations Analysis analysised eight basic yield characters of twenty maize hybirds and disscussed the relations between the individual plant yield and other traits. The results indicated that the order of the relation from big to small was hundred-grain weight,the number of kernel per ear, the number of kernel per line, spike diameter, spike length,the kernel row number, the seeding rate, glabrate end. The conclusion expiousured the main way of maize breeding and high yield cuhurs on this ecological area is to raise hundred-grain weight, the number of kernel per ear and the number of kernel per line and so on other facters. The long spike varieties and big kernel varieties can take as the selection criterion of the high yield varieties.