Abstract: To study the feasibility of biomass carbon to the tobacco soil and tobacco improvement. The black soil were used for experiment from Ning An country of Mutankiang. Biomass carbon was studied in C/N of soil, soil microbial growth , development of tobacco , the conventional chemical composition and the influence of neutral aroma components. The results showed that 1800kg/hm₂ biomass carbon could make the C/N of soil increase by 31.79%. The number of actinomycetes in the soil was 3.8 times as much as the control group. The growth advantage was obvious after applying the biomass carbon, plant height, leaf number were significantly higher than control group. but total sugar and nicotine was not significant. 1200 kg/hm₂ biomass carbon made the potassium content in after baking tobacco increase by 11%. 2400 kg/hm₂ improved total sugar content after baking tobacco by 5.40%. 1800 kg/hm₂ biomass carbon made the tobacco Solanone content was 1.97 times as much as control group. Comprehensive studies have shown that tobacco soil in 1200-1800 kg/hm₂ biomass carbon could improve the soil environment, promote the growth of tobacco and improved the quality of tobacco.