Abstract: To assess the influence of soil pH on tobacco quality in southeast Chongqing, the soil samples andcomposition of tobacco leaves were analyzed. Taking 149 soil samples and the corresponding 149 flue -cured middle tobacco leaf samples from typicality smoke generation countries in southeast Chongqing, Pengshui and Wulong counties as materials, the distributive characteristics and relationship soil pH value and the contents of 9 elements (total K, total Cl, total P, B, Mn, Ni, Cu, As, Fe) in middle tobacco leaves were analyzed. The results indicated that: (1) the tobacco planting soil of Pengshui and Wulong counties was mainly acid soil (4.5