Objective: To study the diagnosis and treatment of infected pseudoaneurysms(PA) resulting from drug injection. Methods:The clinical data of 11 cases of infected PA resulting from drug injection were reviewed retrospectively.1 patient was treated by nonoperation,10 cases were treated by artificial blood vessel transplantation after removal of PA and local debridement. Results:One case dead. All the 10 cases treated by operation had satisfactory results and none had ischemic symptom of the limbs.Eight grafts were patent demonstrated by color Dopler ultrasonography 3 months postoperatively. Conclusions :The diagnosis of PA induced by drug injection can be made by the history of drug injection, pulsate mass of injection site. The effective treatment should include control of infection,local debridement,PA resection and blood vessel implantation.