Abstract: In order to promote the applicability of reconstituted tobacco, the bulk thickness and softness of reconstituted tobacco base sheet materials produced in laboratory under different conditions were analyzed. The effects of tobacco pulp and added fibers, calcium carbonate, and guar gum on the softness of reconstituted tobacco base sheets were investigated. The results showed that: 1) The varieties, beating degrees and addition rates of added fibers, the addition rates of tobacco powder pulp and calcium carbonate, and the beating degree of tobacco pulp affected the softness of the sheet material more greatly than the level of guar gum. When the addition rate of tobacco powder pulp to tobacco pulp increased from 10% to 90%, the softness value of the base sheet material decreased by 61.34%. When the addition rate of calcium carbonate increased from 0 to 20%, the softness value of the base sheet material decreased by 40.09%. As the beating degree of the tobacco pulp increased from 23°SR to 71°SR, the softness value of the base sheet increased by 25.49%. 2) The effects of the different conditions selected in the experiment on the bulk thickness and softness of the base sheet material were opposite, and the variation extent of the softness of the base sheet material after adjusting each parameter was larger than that of the bulk thickness of the base sheet material.