对３个中晚熟杂交高粱的穗分化进行了研究，从穗分化与植株外部形态、与栽培技术三者结合出发，修改了前人的八段划分法，提出六期划分法：用电镜扫描制得穗分化图版，并配合相应的外部植株形态，指出高粱植株拔节、挑旗，分别与幼穗生长锥伸长期及减数分裂期同步，可作为其外部形态标志；指出拔节期是促花增粒、挑旗期是保花增粒的关键追肥时期。 Spike differentiation of three middle-late maturing hybrid sorghums was studied. Based on the combination of spike differentiation, plant external morphology and cultivation techniques, the authors modified the eight-stage division method of the former and put forward the six-stage division method: scanning electron microscopy The results showed that the jointing and flag-raising of sorghum plants were synchronized with the growth of young spike and the stage of meiosis, which could be used as the external morphological marker. Granule, the flag is the key period to protect the grain by grain refinishing.