The effect of konjac glucomannan (KGM) addition on the hygroscopic characteristics of cut tobacco was investigated by using isothermal adsorption/desorption ability testing device. The results showed that the introduction of KGM humectant enhanced the moisture holding capacity of cut tobacco and slowed down the water loss process. The drying rate constants (k) calculated using Henderson & Pabis model were reduced to varying degrees for cut tobacco from different parts of a tobacco plant. In addition, the isothermal sorption and desorption curves exhibited the form of adsorption curve type III. The addition of KGM can effectively increase hygroscopic hysteresis of cut tobacco. Moreover, the hygroscopic hysteresis behavior decreased with increasing temperature and this phenomenon of middle and upper tobacco was more significant than that of lower tobacco. DLP empirical model could describe the isothermal absorption and desorption behavior of cut tobacco with relatively high coefficient R².