We summarized progress in melittin, including the biological function, the molecular structure and characteristics, the mechanism of hemolysis and the relationship between the structure and the activity of hemolysis and antimicrobial of melittin. Meanwhile, based on the related research in our laboratory, we focused on the studies of the mechanism of melittin home and abroad in recent years. We proposed that the study on melittin should be quantified, and the calculation technology should be utilized for further illustrating the dynamical process of melittin and the relationship between structure and function, which may provide a firm theoretical basis for guiding molecular designing in future.