The genetic model of maize including the plant height, ear diameter, ear length, ear placement, row number, grain length, 100 grain weight and plot yield was studied using augmented NC Ⅱ design. The results show that the ear placement and 100 grain weight were inherited in accordance with additive-dominance effect. The plant height and row number were inherited in accordance with additive-dominance-epistatic effect. The grain length and plot yield were inherited in accordance with additive-epistatic effect. The ear diameter and length were inherited in accordance with additive effect. As to the character of dominance, the plant height and ear placement were part-dominance, the 100 grain weight and row number were over-dominance. These characters were both positive and negative in the direction of average dominance.