Abstract: Effect of uncovering membrane to earth up on the ridges when tobaccos were prosperously growing and covering the ridges with straw, uncovering membrane to earth up on the ridge when tobaccos were prosperously growing period on content of chlorophyll, content of MDA and related enzyme activity of flue-cured tobacco leaves during the cultivation in farmland was studied, Result showed that tobacco leaves treated by uncovering membrane to earth up on the ridges when tobaccos were prosperously growing and covering the ridges with straw were better than those treated by other treatments in several aspects. Such as: The content of chlorophyll, activity of NR and POD were higher; the content of MDA was lower; The above index of tobacco leaves treated by this agronomy measure changed with the metabolism regulative mechanism of flue-cured tobacco consistent. So this agronomy measure is worthy to be promoted in Xinyang even Huanghuai tobacco area.