In this research, we deal with three kinds of cellulose fibers with different treatments, and examine these fibers' change of moisture sorption and desorption under all kinds of relative humidity before and after dealing by using the completely wet testing machine. We discovered in the research that after different treatments the change of the moisture sorption was affected by the change of the thickness of NaOH. That's because cellulose fibers will destroy the fibers' crystalline and made it to have swelling phenomenon after the NaOH's treatment. The fibers which were treated with zyme would be hydrolyzed on the facial part. For example, by using the completely wet testing machine we could discover that Lyocell with 95% of relative humidity before any treatment, the moisture regain is 17.5%. And after the treatment of a thickness of 10% NaOH, the moisture regain increased to 23.9%. The moisture regain increased to 21.1% after the zyme treatment. The moisture regain which use zyme treatment first and then the thickness of 10% NaOH treatment is 21.5%, and with the thickness of 10% NaOH treatment first and then the zyme treatment is 20.8%. We could discover in the experiment that most of the moisture regain had an apparent increase with treated fibers.
