Abstract: Hydrogels are widely used in biomedical fields such as drug delivery, wound dressings and tissue engineering because of their good biocompatibility and biodegradability. According to the source of material, it can be divided into synthetic material hydrogel and natural material hydrogel. Natural polysaccharide hydrogel not only can be used as material, but also has unique pharmacological activity and better mechanical properties, gradually become the preferred material. Dynamic covalent hydrogels have attracted much attention due to their structural flexibility, self healing performance and environmental responsiveness. In this paper, the dynamic bond mode natural polysaccharide hydrogel systems are classified and summarized, and the research status of the construction of this kind of hydrogel in drug delivery and tissue repair are summarized, to provide reference for the application of new polysaccharide hydrogels in clinical application.