Abstract: OBJECTIVE To analyze the molecular types of multidrug resistant Acinetobacter bamannii（MDRAB）strains causing bloodstream infections by pulsed field gel electrophoresis（PFGE）,so as to investigate the homology of these drug resistant strains,and comprehend the epidemic and distribution characteristics.METHODS Totally95 strains of MDRAB strains causing bloodstream infections were collected from the patients of the general hospital of Chinese People′s Liberation Army from Apr.2007 to Jun.2013,and the homology of these strains were analyzed by PFGE and Bionumerics Applied Maths software.RESULTS Ninety-five strains of MDRAB were divided into 14 clonal strains named A to N,and the primary clonal strains were C,E,and J,accounting for 20.00%,29.47%,and 20.00%,respectively,which mainly spread across the Respiratory,ICU and Emergency Department.The time distribution of these clonal types showed that most of them were epidemic sporadically.CONCLUSION There were 14 clonal strains of MDRAB causing bloodstream infections from Apr.2007 to Jun.2013,and the primary clonal strains were C,E,and J,mainly spreading across the Respiratory,ICU and Emergency Department.We should monitor goal-directedly and strengthen the control of nonsocomial infection.