The six necessary investigations of homicide prevention and control are prevention, investigation, case solving, stable control, investigation and situation analysis. According to the relevant public information inquired, we can find out whether contradictions and disputes are investigated and resolved, the source of crime tools and related key items management, public security prevention and control measures, investigation and control of key people, safety prevention of key places, and control of key time periods are in place, so as to investigate and deal with a case, analyze a case, rectify a case, ask for accountability and warn a case. On the basis of fully implementing the "Implementation Measures on Further Improving the Supervision and Investigation System of Responsibility for Homicide Prevention and Control (Trial)" issued by the province and the state, the four unifications of supervision and investigation of responsibility for homicide prevention and control should be further clarified, and efforts should be made to create a high-quality and safe social environment for the future economic development of Guangnan, earnestly perform political duties and work duties, and prevent homicides in the prevention stage before crimes occur.