Liao Yu 20 and Liao Yu 18 were used as experimental material in this research. Quality of maize seeds with different genes and from different ecological zone are investigated by contrasting physical quality and sowing quality of cross-breed seed; not only the effect to quality of the same cross-breed maize seeds by ecological factors is discussed, but also quality of cross-breed seed with different gene from the same ecological zone is compared with each other. Therefore main ecological factors which have i...