Abstract: The combining ability and genetic parameter of 10 quantitative characters of the male sterile line A87A,W9706A and the other 6 common inbred lines.On the basis of GCAand SCA,make sure A87A、 W9706A、J1643、Dan598this four inbred line have a high utilization value,the group of W9706A×J1643have a high heterosis and determinate potentialan,and so on.According to the parameter estimation of combining ability,general combining ability to occupy more than specific combining ability,we should pay more attention to choose general combining ability to be parent.in addition,more attention to selectthe specific combining ability.