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对目前具有代表性的大穗小麦品系幼穗分化进行了２年系统观察，结果表明：大穗小麦幼穗分化速度快，比对照品种提高１９．４６％和２２．８２％；单棱分化时期短，比对照品种少４２．５ｄ，降低４０．９６％；进入二棱期早且二棱期长，比对照品种早５０～８６ｄ，增加２５．７ｄ；护颖分化期和小花原基分化期比对照品种增长５．５ｄ和５．７ｄ，雌雄蕊原基分化期和药隔分化期差异不大。其中，幼穗分化速度快是决定大穗小麦具有较多小穗数的主要原因。
Two-year systematic observation on spike differentiation of the current large-spike wheat lines showed that the spikelet differentiation rate of large-spike wheat was 19.46% and 22.82% higher than that of the control varieties, respectively. Short, shorter than the control varieties 42.5d, decreased 40.96%; into the two sides of the early two-phase and long, than the control varieties 50 ~ 86d, an increase of 25.7d; retaining Ying differentiation and primordium differentiation Compared with the control varieties increased 5.5d and 5.7d, pistillate primordium differentiation and differentiation of drug-resistant little difference. Among them, spike differentiation is the main reason that determines the number of spikelets in large-spike wheat.