Abstract:  In order to explore suitable corn straw returning modes to promote the sustainable development of modern tobacco agriculture， effects of different corn straw returning modes on dry matter accumulation， economic traits， internal quality of flue\|cured tobacco and soil fertility were determined in 2012-2013. It was shown that comparing with non\|straw returning， corn straw returning significantly increased tobacco dry matter accumulation. The yield of flue\|cured tobacco with corn straw returning increased by 39%-48%， and the output growth increased by 51%-79% compared with the control. Besides， corn straw returning effectively improved physical properties， chemical composition and taste of tobacco leaves and increased soil fertility. Among all the tested corn straw returning modes， corn straw returning with decomposition maturing agent exhibited better effects on increasing biomass yield， soil microorganism quantity， and improving economic traits of tobacco leaves， while the mode of corn straw returning directly showed better effects on improving the internal quality of flue\|cured tobacco.

Key words: straw returning, internal quality, physical properties, flue\, cured tobacco, micro\, environment