Semaglutide is a new generation GLP-1 (glucagon-like peptide-1) analogues. Semaglutide is a long-acting dosage form based on the basic structure of liraglutide, which is more effective in the treatment of type 2 diabetes mellitus. Compared with lilarlutide, somalutide has a longer aliphobic chain and an increased hydrophobicity, but somalutide is modified with a short chain of PEG, and its hydrophilicity is greatly enhanced.PEG modification can not only tightly bind to albumin, cover up the DPP-4 enzymatic hydrolysis site, but also reduce renal excretion, prolong the biological half-life, and achieve the effect of long circulation.