Fifty-two flue-cured tobacco leaves graded C3F and B2F were sampled from eleven towns of Shaowu City, their routine chemical components were measured which included the contents of total alkaloid (TA), total nitrogen (TN), K⁺, Cl^-, reducing sugar (RS) and starch, the ratios of RS to TA, TN to TA and K⁺ to Cl^- were calculated, and then these indices were applied to evaluate the chemical qualities of the flue-cured tobacco leaves. The results showed that in general the contents of TN, TA, RS, K⁺, Cl^- and starch were all in the suitable levels, and the above three ratios were also in the harmonious levels. The main indexes reached the corresponding high quality standards of Chinese flue-cured tobacco. There were obvious differences in the general chemical compositions between C3F and B2F from some towns, which indicated it was necessary to optimize the techniques in the processes of tobacco planting and curing, attentions should be paid to control the harvest maturity of the upper leaves and to adjust the curing technological parameters according to the status of fresh tobacco leaves especially.