The fluecured tobacco variety Yunyan 87 was selected to study the effect of different potassium fertilizations on potassium absorption.The results showed that compared with no potassium application treatment,potassium application increased dry matter accumulation of plant.Among different potassium fertilizations,the dry matter accumulation of BCPF(biomaterialenveloped controlledrelease potassium fertilizer)treatment was the highest after 60 days of transplanting.Potassium application increased the readily available potassium in soil and the potassium concentration in plant.Before 45 days after transplanting,the readily available potassium in soil and the potassium concentration in plant with PC(potassium carbonate)treatment were the highest.After 60 days of transplanting,the readily available potassium in soil and the potassium concentration in different plant parts with BCPF treatment were the highest.Compared with conventional PSF(potassium sulphate fertilizer)treatment,the BCPF treatment and PC treatment increased the potassium use efficiency by 16.81 and 7.93 percentage points respectively.By analysis from potassium content of baked tobacco leaves,the BCPF treatment and PC treatment significantly increased the potassium content.It was concluded that instead of conventional PSF,BCPF and PC application could increase potassium use efficiency and potassium content in leaves,and should be used in fluecured tobacco production.