This study aimed to explore the relationship between the traumatic experience in childhood and onset of obsession in adulthood, and the character of family environment of obsession patients.According to CCMD-3 standard, 31 patients with obsession of in and out-patient department of psychology were randomly chosen in research group, another 26 normal subjects as normal control. Child Abuse and Trauma Scale (CAT) and Family Environment Scale-Chinese Version (FES-CV) are used in the study, based on these scale...