Abstract: Although the occurrence of homicide-suicide was low, it often resulted in casualty of the family member, even the annihilation of the family. At the same time, it related to morbidity, family violence and serious social damage. By means of reviewed the related studies, the author firstly introduced the notion development and occurrence of the homicide-suicide briefly, then introduced it′s criminological character, type and relationship with the mental disorders, in the end combining the forensic psychiatric practice, the author put forward the researching way of the cases. [

Key words: homicide, suicide, homicide-suicide