This research for high force polyethylene fiber after cotton and kapok encystation discussion its hydroscopic property. The general service-type fabric mostly uses nylon and the cotton and kapok blend fabric, but along with technical and weapon fast development, therefore then develops the high force polyethylene (UHMWPE) substitution nylon and the cotton and kapok blend fabric, but is bad because of the high force polyethylene hygroscopicity, but causes the fabric comfort to be insufficient, therefore this experiment discusses in view of this flaw, not only anticipates the PE/C encystation fabric to be possible to substitute for the N/C fabric in the force, also may promote the fabric to the human body comfort.