Abstract:In this study, the topsoil samples of 5 176 in total tobacco-planting fields in Wenshan Prefecture of Yunnan Province were collected annually from 2005 to 2020, and soil pH values, the contents of organic matter (SOM), alkali-hydrolyzed nitrogen (AN), available phosphorus (AP) and rapidly available potassium (AK) were determined, and then their contents, grade proportions and annual changes were analyzed. The results showed that the average pH, SOM, AN and AP were 6.40, 25.65 g/kg, 102.25 mg/kg and 18.84 mg/kg, respectively, which were all belonged to the suitable grades for tobacco-planting, while the average AK was 164.33 mg/kg, which was belonged to the high grade for tobacco-planting. AK was increased significantly with year (y = 96.13e0.0615x, R2 = 0.847 6**, P<0.01), however, pH, SOM, AN and AP changed irregularly or complex. The sample proportions were the highest in suitable grades for pH, SOM and AN, which meanly were 50.02%, 65.17% and 54.15%, respectively. The sample proportions were roughly similar between the suitable grades and high grades for AP and AK, which were 46.98% and 40.49% for AP, and 46.03% and 45.50% for AK, respectively. The sample proportions of the suitable grades of pH and AK were decreased significantly with year (pH: y= 1027e-0.029x, R2 = 0.609 3**, P<0.01; AK: y = 0.0519x2-211.66x + 215872, R2 = 0.886 2**, P<0.01), the sample proportions of the suitable grades of SOM, AN and AP were insignificantly increased with the year (P>0.05). For tobacco planting, there were 25.84% and 33.50% of tobacco-planting fields in 2020 in Wenshan Prefecture were low or high in soil pH, 7.76% and 7.87%, 34.42% and 42.9% of tobacco-planting fields were low or high in AN and AK, while most of the tobacco-planting fields (73.34%) were high in AK. In view of the above problems, different measures should be taken in order to improve the soil suitability of tobacco-planting.