Abstract: Chlorophyll contents，net photosynthetic rates and chlorophyll fluorescence parameters of the flue-cured tobacco leaves were measured to study the differences in photosynthetic characteristics among different cake fertilizers rates, The result showed that the Chlorophyll contents of tobacco leaves were increased with the increasing rates of cake fertilizers and the PSⅡ potential activation，the maximal quantum efficiency, Qp of PSⅡ of tobacco leaves were increased too, and then stimulated the photosynthetic rates increasing. And the result of experiment showed that the photosynthetic capability of tobacco leaves were Improved and the net photosynthetic rates were increased with the suit increasing rates of cake fertilizers，but the photochemical quenching coefficient and ΦPSⅡ was decreased by high nitrogen level.