A cooperative study on B fertilizer amount and Mg fertilizer amount of CB-1 was conducted in Jukou Village of Jianyang City in 2012.The results showed that processed tobaccos did not manifest many differences in the development progress and the growth duration after transplanting.The treatments which led to better agronomic trait performance were B2 M2 、B3 M2 、B3 M3,while the treatments that had high output values were B2 M1 、 B2 M2 、B3 M3.After the comprehensive analysis,we drew the conclusion that the optimum treatments of B and Mg proportion were B2 M2(B fertilizer amount per hectare:7.5 kg,Mg fertilizer amount per hectare:75 kg),B3 M2(B fertilizer amount per hectare:15 kg,Mg fertilizer amount per hectare:75 kg),B3 M3(B fertilizer amount per hectare:15 kg,Mg fertilizer amount per hectare:150 kg).