In this work， poly acrylic acid humidity-controlling composite material was modified by Polyvinyl alcohol，Attapulgite and CaCl2， and then kinetic experiments of moisture absorption/release on the modified and unmodified humidity-controlling composite materials were carried out with the help of batch adsorption/desorption experiment. The thermal decomposition temperature and structure of humidity-controlling composite material were estimated separately by means of TG-DTA and FTIR， and the effects of modification on the moisture absorption/release of humidity-controlling composite material were discussed. Results showed that: （1）The composite of Organic Humidity Controlling Materials, inorganic melt and inorganic mineral was a better way to prepare high effective humidity-controlling material;(2)Compared with the unmodified humidity-controlling composite material， the moisture content and the hygroscopic rate of the humidity-controlling composite material modified by CaCl2 was respectively two and six times of that of the unmodified humidity-controlling composite material at RH
