The work aims to control the humidity of the microenvironment with compound humidity control gel P(NAC), so that the humidity of the microenvironment is relatively stable, and the effects of changed environmental humidity on the moisture content of cut tobacco are reduced. The gel materials with humidity control function were synthesized from N-isopropylacrylamide (NIPAM), acrylic acid, carboxymethyl cellulose and glycerol by means of free radical polymerization. The effects of humidity control gel P(NAC) on the moisture content of cut tobacco were studied under different humidity. Pretreatment of P(NAC) was conducted under relative humidity RH=60%. When the ambient relative humidity was 40%-70%, the moisture content of cut tobacco containing P(NAC) changed slightly, in the range of 10.94%-12.95%; while the moisture content of cut tobacco without P(NAC) changed significantly, which was 8.43%-14.36%. The compound humidity control gel P(NAC) has certain practical application value in controlling the micro-environment humidity, reducing the moisture content change of cut tobacco, and maintaining the stability and quality of cut tobacco.