对不同基因型甜玉米乳熟期籽粒可溶性精含量、含水量以及与有效积温之间关系的分析研究表明：超甜玉米（ｓｈｚｓｈｚ）的适宜采摘期有效积温为３１０～４００℃，普甜玉米（ｓｕｌｓｕｌ）为２６０～３２０℃；普甜玉米适宜采摘期比超甜玉米早，但适宜采摘期限要比超甜玉米短．这是由于超甜玉米存在一个含水量平稳期，并恰好在适宜采摘期内，而普甜玉米不存在。本文认为，采用有效积温法判断甜玉米的适宜采摘期是准确可靠的，也是简便易行的。 The results showed that the effective accumulated temperature of shzshz was 310 ~ 400 ℃ during the ripening stage of sweet corn, and the correlation between the soluble water content and effective accumulated temperature was significant sulsul) is 260 ~ 320 ℃; Pu sweet corn suitable for picking period earlier than the sweet corn, but suitable for picking shorter than the sweet corn. This is due to the presence of a steady period of water content in the super-sweet corn, which happens to be in the right picking period, whereas the sweet corn does not exist. This paper argues that the use of effective accumulated temperature to determine sweet corn picking period is accurate and reliable, but also simple and easy.