Phage display is a new technology that utilizes phage to express exogenous peptide or protein gene fusions on its surface.Current-ly,phage display technology is extensively employed in the identification of target molecules with specific functions.This technology also plays a vital role in antigenic epitope analysis,therapy for bacterial or viral infections,preparation of specific antibodies,and screening of enzyme preparations.This paper reviews the application of this technology to veterinary pathogenic microbiological diagnosis,with a view to providing theoretical and technical references for the application and development of this technology in the veterinary field.