Sanitary napkins mainly include surface layer, absorption core, bottom three layers of structure, each layer of materials with hot melt adhesive bonding. The outermost layer (i.e. the bottom layer) is nonwoven, and the material is soft. Inside is a leak-proof film (composed of waterproof paper or polyethylene film). Then inside is the toilet paper wrapped with polymer water absorbent fluff pulp, forming a strong absorber, once the menstrual blood infiltrates this layer, it will be firmly attached, will not reverse or scatter. There is pressure sensitive tape (self-adhesive) on the back of the sanitary napkin, which is lined with the release paper. When using, just pull off the release paper and throw it away, and then stick the tape on the underwear to prevent slippage.