This paper shows the definition of serial murders,discusses the idea of investigative range,points out the features of area and personnel involved,and puts forward the best decision of investigative range,which can provide basis for solving cases timely.

Expertise of forensic psychiatry on murder case of 179 schizophrenics;

Analyses of 84 murder cases in forensic psychiatric expertise;

Grasping its criminal regular patterns and studying the investigation countermeasures are helpful in effectively preventing,suppressing and cracking down series of murder cases.

In recent years, serial homicide cases abroad is increasing .

In serial homicide cases,criminal offenders\' mental activities will be showed by scene materials and traces,and they will be directly or indirectly reflected in the crime scene through criminal acts.