Qiaocheng district of Bozhou City is the main region of tobacco-planting of North Anhui, but the potassium content is low in the tobacco leaves. In order to disclose the potassium status in soils and their changes, this study collected soil samples in the year of 2013 from the plough horizons of 90 typical fields, analyzed the contents of total potassium (TK), slowly available potassium (SAK) and rapidly available potassium (RAK), compared these data with the corresponding historical data obtained in the 2nd national soil survey of 1980s. The results showed that TK content was low while SAK and RAK contents generally were high. SAK contents were lower in northwest, south and east regions, RAK was lower in the north of Guo River. Compared to the corresponding data obtained in 1980s, RAK contents increased in plough horizons where no tobacco was planted, but kept rough balance or decreased in plough horizons where tobacco was planted. SAK and RAK contents were lower in the current main tobacco-planting region of northwest, so it should increase the application amount of potassium fertilizers and plant tobacco in the southwest region and middle region where SAK and RAK contents were higher.