Abstract: Potassium is the most important quality element of tobacco. This paper has fully discussed the potassium nutritional physiology, the chemical behavior in soil of potassium and the possible reasons of low potassium content of China tobacco leaf in some aspects, such as the physiology function, the relations with quality of tobacco leaf, the soil chemistry of potassium, uptake and distribution of tobacco plant, etc. Furthermore, we investigated the potassium application on tobacco production in China and summarized the following conclusions. 1. The major type of potassium applied on tobacco production in China is K2SO4 and KNO3. 2. Increasing K application had a tendency to raise K level in leaf. 3. Apply K in several times better than in one time. 4. K should apply into soil before NH4+-N applied and deep application. Double layer application is better than basal dressing. 5. K2SO4 and KNO3 apply together better than only apply KNO3.