Abstract:Antimicrobial peptides are a class of small peptides with anti-extrogenous pathogen activities. They are derived from organism and possess antibacterial, antifungus, antiviruses and anticancer cell actions. In recent years, it’s found that some microbial pathogens are able to resist antimicrobial peptides. The constitutive and inducible mechanism of a pathogen resists a given peptide were reviewed in this paper.