Abstract: Pot cultivation trial was conducted to study the effects of various ways of boron fertilizer application on the potassium content,smoke characters and sensory evaluation of cured upper leaves.The following treatments were included:no boron fertilizer applying(CK),applying into soil before seedling transplanting(P0),spraying on upper leaves(P1),spraying on middle leaves(P2),spraying on lower leaves(P3),and spraying on the whole plant(P4).The results showed that:compared with the CK treatment,the potassium content in leaves from P0,P2 and P4 treatments did not increase;and the potassium content in leaves from P1,P3 treatments increased significantly;spraying on upper leaves could significantly reduce total particulate matters and tar yields.Therefore,spraying boron fertilizer on upper leaves would be favorable for improving their industrial usability.