Corn Zheng’dan number14, Corn Zheng’dan number18,Corn Zheng’dan number21 and Corn Zheng’dan number958 are compactness vertical leaf new variety utilized to popularize to use in recent years. From crop physiological biochemistry, of type characteristic, etc to study, Corn Zheng’dan number14 is the high yield, produce steadily, and early-maturing. Its reasons are：(1) The change of, Index of area of the leaf is reasonable, blade hold green long, and become old Slowly. (2) The only shut the pigment of chloroplast; protein and soluble candy are high. (3) Peroxide enzyme activation is high. Third 2 aldehyde is little, photosynthesis is high. (4) The seed grains of heavy volume is high, the time of forming a vesicle is long, a thousand is heavy and high.