Abstract: The eight maize inbred lines have been tested with the design of p1×p2incomplete diallel crossing of NCII method to study on general combining ability（GCA）,special combining ability（SCA） and hereditary parameter of nine character which were plant heigh, hight from ground to ear, ear length,ear thickness, ear rows, row grains, bald tip length, weigh of hundred grain and plot yield. The result showed those nine character were majorly controlled by the effects of additive gene with less action of non-additive gene effects.The lines of C1,C3 and C5with the higher common combining ability, its use value of the parent. The lines of W46 with higher common combining ability of ear character, which could be selected according to the breeding targeted. The lines of C2 and C7with less comprehensive character must be modified before used. The three combination of ZH3,ZH16 and ZH24 with heterosis and Yield potential is very strong, In the actual production we should strengthen to use it. In maize breeding program. The eight character such as plant heigh,ear heigh and plot yield per plant should be selected earlier and the character such as weigh of hundred grain per plant should be selected interim or later.