对６个中熟玉米品种在我国西南地区不同纬度和海拔高度的灌浆期、千粒重、株高和穗位高的变异与纬度和海拔的关系进行了分析。结果表明，品种的上述４个性状与纬度和海拔之间均表现为二元线性回归关系，模型对性状的决定程度达９０％以上。当海拔高度不变，纬度每升高１°，灌浆期平均延长１．１３±０．０３８ｄ，千粒重、株高和穗位高分别平均增加９．８２±０．０８１ｇ、８．２２±０．９４１ｃｍ和３．４０±０．５０８ｃｍ；纬度不变，海拔每升高１００ｍ，灌浆期平均延长１．３３±０．１４９ｄ，千粒重、株高和穗位高增加不明显。这些结果年度间、品种间表现出高度的一致性 The relationship between the variation of 1000-grain weight, plant height and ear height and latitude and altitude in 6 mid-maturing corn varieties at different latitudes and altitudes in Southwest China during the filling stage was analyzed. The results showed that there was a binary linear regression relationship between the above four traits and latitude and altitude, and the model was more than 90% of the traits. When the altitude was the same, the latitude increased by 1 ° per hour and the average grain filling period was 1.13 ± 0.038d. The average grain weight, plant height and ear height increased by 9.82 ± 0.081g and 8.22 ± 0 respectively. 941 cm and 3.40 ± 0.508 cm, respectively. The latitude was unchanged at each elevation of 100 m and the average grain filling period was 1.33 ± 0.149 d. The grain weight, plant height and ear height were not significantly increased. During the year of these results, the breeds showed a high degree of consistency