Abstract: Using grey relational degree analysis method, 29 new maize hybrid varieties in Yunnan Province were used as experimental
materials to analyze the correlation between agronomic traits such as plant height, ear height, ear length, ear diameter, bald tip length,rows per ear, kernels per row, hundred-grain weight, kernel rate and water content with yield. The results showed that the order of relational degree between yield and each agronomic trait was as follow: ear length＞kernel rate＞plant height＞ear height＞hundredgrain weight＞ear diameter＞rows per ear＞kernels per row＞water content＞bald tip length; the order of correlation between yield and each agronomic trait was as follow: kernel rate＞hundred-grain weight＞ear diameter＞plant height＞ear height＞rows per ear＞ear length＞bald tip length＞kernels per row＞water content. The varieties with the best comprehensive evaluation were Yuanyu 1505, Linxin 11 and Zhuyu 818. In this study, excellent new maize hybrid varieties were screened out, and the primary and secondary
relationship of each agronomic trait on yield was clarified, which could provide a theoretical basis for the selection of high-yield and
high-quality maize hybrid.

Key words: maize, yield, agronomic traits, grey relational degree, correlation