Analysis on Combining Ability of Main Agronomic Characters in Improved Maize Inbred Lines from Temperature Zone Maize Germplasm

15 maize inbred lines(from Northeast and Huang huai hai region) used were crossed according to Griffing's method four,105 single crosses were got completed random block design taken,analyzing ten character' GCA,SCA,TCA which are plant height,ear position,ear length,ear rows,and so on,and estimated each inbred line's SCA.The result showed that all inbred lines had remarkable variance of GCA,SCA.Comprehensive characters of inbred-line W17,W16,W18,6-25,W14 were outstanding and those were an excellent maize inbred lines on how to cross.