The discussion of drug-addicts' relapse prediction of risk factors has already become one of the fields of criminological studies. It is very important for treatment centers to understand drug-addicts' risk factors for relapse .This study probes into the characteristics of drug-addicts' risk factors for relapse, the relation between risk factors and relapse, relapse prediction of risk factors. There are significant relations between relapse and nine risk factors, "the certificates or specialties", "the gang's involvement", "the situation of the family meeting", "the meeting of the previous addictive friends", "marriage status", "alcoholism", "previous convictions", "self-efficacy questionnaire", "experience of using multiple drugs". Four of which are predictable for relapse namely. This study proposes that drug addiction treatment centers should plan individual addict's treatment strategy according to the risk factors. Future study can involve as many dynamic and static risk factors as possible to understand the influence and explanation of risk factors for relapse.