Chitosan has good biocompatibility and is widely used in biomedicine and pharmaceuticals. It can be used as a wound dressing and wound healing agent. The wound healing speed can be increased by 75% after the coated gauze is treated with chitosan. The absorbable surgical suture made of chitosan has high mechanical strength and can be stored for a long time. It can be sterilized with conventional methods. It can be dyed and can be added into the medicine. It can be degraded and absorbed by the tissue and relieved the pain of the patient's disassembly. Chitosan can inhibit gastric acid and ulcer, and has the effect of degrading cholesterol and three glyceride. Heparin is a very effective anticoagulant with sulfonyl and carboxyl groups. The sulfated chitosan is similar to heparin in structure. The heparin like derivatives generally have considerable or even exceed the heparin activity, providing an effective way to provide cheap anticoagulants. In addition, chitosan can also be used to make dialysis membranes and contact lenses for artificial kidney. The microcapsule prepared from chitosan is a biodegradable polymer membrane material. It is an excellent and promising medical sustained release system.

In addition,Chitosan can be used as preservative film in food. Applying the water solution to the surface of fruit and vegetable can form a closed environment of low oxygen and high carbon dioxide on the surface of fruit and vegetable, inhibit the respiration of fruit and vegetable, and inhibit the reproduction, improve the glossiness of fruits and vegetables, and improve the sensory quality of fruit and fruit trees.