Abstract: Antimicrobial peptides are generally called peptide exhibited antimicrobial activity in organism and it is an important part of the innate immune system in plants and animals.Previous studies have showed that antimicrobial peptides have broad application prospects in agriculture,medicine,food and other fields.In the present study,the origin,classification,structural characteristics of antimicrobial peptides and possible mechanism to important plant disease control such as citrus Huanglongbing were reviewed.In the end,the application prospects and problems were discussed.