In order to study the relationship among the effective accumulated temperature , stem diameter and the K rate , different K treatments were set , the data of stem diameter and weather regime were taken notes regularly , and the data were analyzed by Curve Expert software .The results showed that the Rich-ards model and Gauss model were fitting best , the correlation coefficients were 0.995 and 0.996 , respec-tively.The results could be effectively used to estimate the changes of stem diameter in every period of sweet corn growth , and provided the data support in production management .%为了研究玉米整个生育期有效积温以及钾肥使用量与茎粗的关系，通过设置不同钾肥水平处理的田间试验，定期定株测量甜玉米茎粗数据，以及同步记录相关气象数据，并利用CurveExpert软件进行拟合．结果表明， Richards模型和高斯模型拟合结果最好，相关系数分别为0．995和0．996．该结果可以有效地估测各个生育期甜玉米茎粗的变化，可为甜玉米生产管理提供数据支持．
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