高粱籽粒灌浆期功能叶片比叶重呈下降变化。低产品种下降最快，中产品种次之，高产品种下降最慢（旗叶低、中、高产品种比叶重下降速率分别为２９５，２０２和１２７ｍｇ／（ｄｍ２·ｄ）；上数第二叶片比叶重下降速率分别为２８３，１８２和１８２ｍｇ／（ｄｍ２·ｄ）。高粱籽粒灌浆期功能叶片比叶重与单株产量呈正相关关系，并随着灌浆的时间进程，其相关程度越密切。 Sorghum grain filling stage functional leaves than leaf weight decreased. The decline rate of low-yielding varieties was the fastest, middle-yielding varieties were the second, and that of high-yielding varieties was the slowest (the rate of decrease of specific leaf weight was 2.95,202 and 1.27mg / (dm2 · d ), And the second leaf specific leaf weight loss rates were 2.83,182 and 1.82 mg / (dm2 · d), respectively.The functional leaves of sorghum had a positive correlation with leaf weight per plant and grain yield at grain filling stage With the grouting of the time course, the more relevant the degree.