玉米子粒大小及其整齐度是玉米商品品质的重要指标之一。目前，常使用粒重(百粒重)来衡量子粒的大小，但粒重不能真实反映粒的体积和大小。通过对吉林省133个玉米品种子粒大小的研究对比分析，用体积表示法比百粒重法能更好的体现玉米品种子粒大小，提出了玉米子粒大小的体积表示法(粒数/L)和分级标准。分级标准划为3个等级，小粒在2 000粒/L以上，中粒在1 700～2 000粒/L，大粒在1 700粒/L以下。参试玉米品种中子粒大小以中粒品种最多，为60.9%，其次是小粒品种，大粒品种最少。

The maize kernel size and uniformity is one of important targets of commercial quality. At present the hundred kernel weight were used to reflect kernel size. But it could not measure real kernel volume. By analysis on kernel size of 133 maize varieties had certain planter scale in Jilin province. The results showed that the method of volume measurement can better reflect the maize variety kernel size. The method of volume measurement had three rank standards, small grain had more than 2 000 grain/L, medium grain 1 700 - 2 000 grain/L, big grain below 1 700 grain/L. The kernel size of maize variety were analyzed and classification. The results showed that variety of medium grain was most much, accounted for 60.9%, next was the variety of small grain, but variety of the big grain was the least.