The effects of mulching,topdressing potassium and ridging times on the photosynthetic characteristics,potassium content,yield and quality of fluecured tobacco were studied by the field experiment,and the test material was Zhongyan 100.The results indicated that the treatment of black and white plastic mulch+potassium after tobacco transplanting 30 d+ridging twice significantly enhanced photosynthetic performance and promoted the dry matter of fluecured tobacco,and its potassium content and accumulation was significantly higher than other treatments,it had more appropriate chemical components and higher output compared with other treatments.For normal mulch treatment,top dressing potassium was better being applied after transplanting 45 d than 30 d,while for black and white mulch treatment it was better after transplanting 30 d than 45 d.Twice ridging treatment had more favorable effect on growth of tobacco than ridging one time.Based on these results,the black and white plastic mulch+potassium after tobacco transplanting 30 d+ridging twice treatment could effectively enhance the photosynthetic performance and improve the potassium content and yield and quality of tobacco leaves.