Glycoprotein is a protein containing oligosaccharide chains, which are covalently linked to each other and are usually linked to the protein through glycosylation during co-translational modification or post-translational modification. The structure of glycoprotein consists of two parts: polypeptide chain and sugar, which are connected to the polypeptide chain by glycopeptide bonds. It can be used in antibodies, vaccines and diagnostic tools. Glycopeptides refer to peptide molecules containing sugar chains, which are usually composed of a small amount of amino acids and one or more sugar molecules. Glycopeptides can be divided into N-glycosylation, O-glycosylation, and O-GlcNAC glycosylation according to the connection between amino acids and sugars, and can be used in antibiotics and drug design.