Biocompatibility refers to the complex biological, physical, and chemical reactions caused by biomaterials in specific parts of the body, that is, whether certain materials or drugs can be "compatible" with or implanted into the body, and whether they will cause harm to people's bodies. The purpose of the principle of biosafety is to eliminate the destructive effects of biomaterials on human organs, such as cytotoxicity and carcinogenicity. Biomaterials are foreign objects to the host and will inevitably produce a certain response or rejection phenomenon in the body. Therefore, it is necessary to evaluate the biological safety of biomaterials to ensure that they are accepted by the host and do not produce harmful effects. The principle of biological functionality refers to the ability to stimulate appropriate host responses in special applications, which not only evaluates the toxic side effects of biomaterials, but also further evaluates the impact of materials on biological functions.