To understand the prevalence of workplace violence of the state-owned hospitals and private hospitals and to compare the characteristics of them in Tangshan city. Cluster sampling method were used to investigate the three state-owned hospitals and five private hospitals， medical staff who suffer violence in the workplace from April 2008 to April 2009 in Tangshan city. The incidence rate of workplace violence in state-owned hospitals(62.98%) was higher than private hospitals（13.55％）. The type of the violence is mainly psychological violence both in state-owned hospitals and private hospitals. And state-owned hospitals’ incidence of psychological violence (46.48％) was higher than private hospitals（13.55％）. Both state-owned hospitals and private hospitals， the violence mainly occurred during daytime hours. Violence of state-owned hospital most occurred in wards（47.92%）， while private hospitals most occurred in medical rooms（32.35%）. The most important reasons for workplace violence in State-owned hospitals and private hospitals were the perpetrators of alcohol (42.81%) and patients without improvement or self-opinion that there is no improvement（57.35％）, respectively. Private Hospitals’ incidence of workplace violence is lower than the state-owned hospitals’ in Tangshan city， According to the characteristics of various hospitals， we should implement interventions to reduce the incidence of violence in the hospital.