New Algorithm for the Reliability Distribute of the SystemZONG Xiao,WANG Chun-jie,ZHAO Xiang(School of Mechanical Engineering and Automation,Beihang University,Beijing 100083,China)This paper introduced a new optimize method,in which the index that could describe the internal structure characteristic and the outer influence factor of the model of the system reliability.Based on the index,this paper also designed a new algorithm that was used to distribute the reliability to the separated systems reasonably.reliability distribute;optimize;compositive index