The effects of organic and mineral potassium fertilizer on flue cured tobacco growth and yield quality of flue cured tobacco were studied in Henan province by applying organic potassium fertilizer and by potassium silicon calcium mineral fertilizer as the substitution of 15% potassium,plus 85% potassium provided by potassium sulfate.Results showed that compared with the treatment of 100% applied potassium,applying 15% potassium as organic potassium fertilizer or potassium silicon calcium mineral fertilizer and 85% potassium provided by potassium sulfate could effectively increase leaf SPAD value of tobacco at dome period which could delay leaf senescence to ensure more time for leaf maturity.Compared to 100% applied potassium sulfate treatment,tobacco leaf yield and value of treatments applied 15% of potassium by using organic potassium fertilizer,potassium silicon calcium mineral fertilizer (granular) and potassium silicon calcium mineral fertilizer(powder) increased by 16.4%,21.1% and 13.0%; 5 037.3,10 975.0,and 3 306.6 yuan/hm2,respectively.While there were no significant difference between the three treatments for the leaf yield.For the tobacco leaf value,compared to the other treatments,the treatment applied 15% potassium provided by potassium silicon calcium mineral fertilizer (granular) +85% potassium provided by potassium sulfate was the highest among three treatments,which significantly increased potassium content in different position leaves and potassium chloride ratio of leaves in lower and middle position were more than 3.5.