Abstract: Comprehensive analysis of 21 groups of maize hybrids by using principal component analysis, compared with CK,we selected 9 superior hybrid combinations, the result of selected 9 superior hybrid combinations as follows： S1-18, S1-4,S1-6, S1-12, S1-13, S1-14, S1-8, S1-19, S1-20 whose period of duration was 106 days and consisted with CK. The photosynthetic characteristics of Pn, Gs, Ci, Tr than CK respectively increased by 13.92%, 16.67%, 8.86%, 0.92%.Hundred grain weight, kernels per spike, rate of seed and yield respectively than CK increased by 5.56%, 0.71%, 0.20%,9.76%, especially S1-8 and S1-12 among those hybrid combinations had good comprehensive characters, such as period of duration, plant height, ear hight, number of leaves up ear, water content of grain and bract at harvest. Stem internodes puncture strength and breaking strength and number of bracts were consistent with CK, but yield and photosynthetic characteristics were superior to CK, so this two combinations had the available value in breeding.