Both Cecropin and Melittin have antibacterial effects. The hybrid peptide composed of Cecropin A and Melittin A has strong antibacterial activity. Cecropin generally contain more basic amino acids, so the hydrophilicity is relatively strong. This part is a biologically active fragment of Cecropin A; while the unique hydrophobicity and antibacterial activity of Melittin A can allow peptide to enter the bacterial plasma membrane The combination of the two fragments can eliminate bacteria. Cecropin A (1-7)-Melittin A (2-9) amide is such a hybrid peptide with sterilization effect, which is composed of 15 amino acids.