Abstract: The photosynthetic and physiological characteristics of high quality wheat“8901-11-14”at the jointing stage were studied in Huang-Huai-Hai Plain．The results show that the correlated efficiency of the photosynthetic rate and the transpiration rate．as well as that of the photosynthetic rate and the amount of absorbed carbon dioxide，are significantly eorrelated ，while the other concerned factors，such as physiological active radiation(PAR)，the initial concentration of carbon dioxide。and the stomatal conductance，only have a limited influence upon the photosyn thetic rate in this time．The quantitative model of photosyn thetic rate of high quality wheat“8901-11-14”is constructed ．which can be proved suitable in expressing the dynamic day-change of photosynthesis rate at the jointing time．