Abstract: Medical tangles caused by the death of women and infants in perinatal period are very normal in the forensic appraisal. The author collected and analyzed 49 cases of these tangles from many aspects, such as sex and age of the dead, hospital,information of autopsy, fault of medical action and so on,and discovered the normal causes of death,medical action's effects and the causes of tangle. It would be useful to the forensic appraisal,settlement and prevention of these medical tangles.

Key words: forensic pathology, medical tangle, perinatal period, autopsy