The research object of protein chip technology is protein. Its principle is to carry out special chemical treatment on solid phase carrier, and then fix known protein molecular products on it, such as enzymes, antigens, antibodies, receptors, ligands, cytokines, etc. According to the characteristics of these biomolecules, The protein to be tested that can be specifically bound to the trap exists in serum, plasma, lymph, interstitial fluid, urine, exudate, cytolytic fluid, secretory fluid, etc., which is washed, purified, and then confirmed and biochemical analysis. It is used to obtain important life information such as unknown protein components and sequences. The biological function of expression level in vivo, the mutual regulatory relationship with other molecules, drug screening, drug target selection and so on provide strong technical support.