Objective To analyze the antimicrobial resistance profile and homology of the Acinetobacter baumannii strains isolated from Rushan People's Hospital in a three-year period for better control of hospital infections.Methods A.baumannii strains were isolated from clinical specimens during the period from 2013 to 2015.Homology analysis were conducted by pulsed field gel electrophoresis (PFGE) for 60 randomly selected isolates.Results A total of 567 A.baumannii isolates were isolated,85 isolates in 2013,156 in 2014,and 326 in 2015.These isolates were mainly from Department of Respiratory Diseases (47.4％) and ICU (23.8 ％).Overall,62.1％ of the isolates were from sputum specimens followed by secretions (15.2％).All isolates were sensitive to polymyxin B,but all resistant to sulfamethoxazole and ampicillin.The A.baumannii isolates showed increasing resistance rate to imipenem,meropenem,ceftriaxone,and trimethoprim-sulfamethoxazole over the 3-year period,but decreasing resistance rate to gentamicin.The 60 selected isolates were grouped into 4 types by PFGE.A-type was the main pattern.Conclusions A.baumannii strains were mainly isolated from inpatients with respiratory tract infections.The A.baumannii strains showed serious antimicrobial resistance associated with possible clonal spread in this hospital.