Abstract: In a field plot trial, the authors studied the effect of several mulching patterns on the growth and quality of tobacco and on the dynamic changes of soil moisture and temperature. The result showed that, in the treatment of “straw mulching after film uncovered”, the tobacco grown better with proper yield, highest quality and profit. The proportion of medium and high-grade tobacco leaves, especially of the high-grade increased by a big margin. The K2O content amounted to 1.84%, while Cl- reduced to 0.38%, contributing to a suitable K2O/Cl ratio of4.84. Compared with no-mulching control, the other mulching treatments couldn’t improve the grade and quality of tobacco leaves despite of the higher yields. Combined with the optimized techniques of lower-ridge, deep transplanting and earth up, “straw mulching after film uncovered” could keep proper soil moisture and heat regimes for tobacco growth during the whole growing period, in the mean time, promote the formation of developed structural root system, and avail the coordination of the absorption of the water and nutrients, therefore present an efficient approach to “K-increasing and Cl-reducing” practice and the no public hazard production of flue-cured tobacco.