Abstract: The monosaccharide composition, thermal stability and pyrolysis products of the three kinds of refined polysaccharides (CPP1, CPP2, CPP3) was analyzed by using cortex periplocae polysaccharide (CPP) as raw materials. The results showed that the monosaccharide composition of CPP1, CPP2, CPP3 contained mannose (3%, 4%, 3%), arabinose (3%, 15%, 3%), rhamnose (3%, 9%, 16%), galactose (15%, 55%, 34%) and glucose (76%, 17%, 44%). The thermogravimetric results showed that the overall weight loss curves of CPP1, CPP2, CPP3 were consistent, and all of them were in the four weightless stages. The temperature of the three nodes was around 250, 340 and 550℃, respectively. The first weight loss stage of CPP1, CPP2 and CPP3 were 25~250℃, the sample mainly loses free water;the second stage were 250~340℃, the weight loss rate reached 68.63%, 66% and 70%, respectively;the third stage were 340~550℃, the weight loss rate dropped gently in this stage;the fourth stage was 550~900℃, and there was no obvious weight loss step in this stage.The total weight loss of CPP1, CPP2 and CPP3 were 95%, 88% and 86%, respectively. The pyrolysis results showed that pyrolysis products were rich in aroma such as furfural, 5-methylfurfural, 2-methyl-1, 3-cyclopentadione and phenethyl phenyl acetate. The polysaccharide had good thermal stability, and the pyrolysis products could improve the smoking quality of cigarettes, which would provide a basis for the application of the scented polysaccharide in cigarette flavoring.