Crotalicidin is a 34-peptide extracted from venomous snakes, which has a certain antibacterial and biological function. MRI shows that the N-terminus of Crotalicidin has an α-helical structure, and the C-terminus is a conventional linear structure, so Crotalicidin is completely inert to eukaryotic cells, and has certain toxicity to Gram-positive and negative bacteria and to tumors. , Crotalicidin is expected to become a raw material for the development of anti-infection or anti-tumor drugs.