[Objective] To find out the variation rules of the single stem, grain and stalk weight of wheat after its flowering. [Method] With Ping' an No. 7, Tanmai 98, Yunong 202 and Huaimai 20 as the tested varieties, their dry weights were determined every three hours after their flowering, and then a mathematical model was constructed to analyze the quality variation rules of single wheat stem, grains and stalk. [Result] The quality of single stem showed a "fast-slow" variation tendency, the grain weight presented a variation tendency of "slow- fast-slow" , the stem quality increased and then decreased. The change process of single stem, grains and 1 000-grain weight accorded with the Logistic growth curve; while the stalk quality showed a parabola change; the daily increment of single stem decreased sharply; while the daily increment of grains and stalk presented a parabola change. [Conclusion] The study provided theoretical references for the high-yield cultivation of wheat.%[目的]了解小麦花后单茎、籽粒、茎秆质量变化规律.[方法]以平安7号、郯麦98、豫农202和淮麦20为供试品种,花后每3d测定1次干物质量,建立数学模型,分析小麦花后单茎、籽粒、茎秆质量变化规律.[结果]单茎质量呈“快-慢”的变化趋势,籽粒质量呈“慢-快-慢”的变化趋势,茎秆质量先增后减.单茎、籽粒和千粒质量变化过程为Logistic生长曲线；茎秆质量变化为抛物线；单茎日增量呈直线减少趋势；籽粒、茎秆日增量变化趋势为抛物线.[结论]该研究为小麦高产栽培提供了理论参考.
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