Abstract: Objective To explore the epidemiological characteristics of injury among floating population in Dalian. Methods Data of injured patients collected from 6 injury surveillance hospitals in 2006-2017 were retrospectively analyzed. Results There were 38 808 injured patients to be enrolled, including 27 445 cases of male, female 11 363 cases, the ratio of male to female was 2.42:1; The 69.98% of injury occurred among the people who were 21-50 years old; The major professions were professional technicians (23.98%) and commercial service personnel (22.54%); The leading three causes of injury were blunt injury (28.21%), fall (23.93%) and sharp injury (20.61%); The injury occurred mainly in industrial/building sites (23.58%), followed by road/street (18.23%); The injury was more likely to occur when having leisure activities (36.77%) and working (30.18%); The 79.69% of injury occurred unintentionally; The most common injured position was the upper limb; The severity of injuries were 75.12%, moderate injuries were 23.41%, and severe injuries were 1.47%. Conclusion Injury have constituted a threat to the health of the floating population in Dalian, it is essential to formulate targeted classified strategies to reduce the occurrence of injury.