Abstract: After high temperature and high humidity treatment of reconstituted tabacco stem,while comparing the change of microscopic structure and Stem extract solid content before and after such treatment,the result showed that:swelling effect is evident after treatment;the Cpk of Stem extract solid content elevates from 0.27 to o.65,the degree of accurancy and precision doubles,variance reduces from 1.0 to 0.6 and volatility declines 40%.

Key words: reconstituted tabacco, high temperature and high humidity, tabacco stem, microscopic structure, extraction effect