Voluntary service organizations are a vigorous and energetic social force. Their participation in vagrants and beggars assistance services can not only supplement the current vacancies in assistance management，but also make vagrants and beggars assistance services more vigorous. The linkage mechanism builds a framework and platform for voluntary service organizations to participate in vagrants and beggars assistance services. Within this framework，voluntary service organizations can clarify their own roles and responsibilities；on this platform，voluntary service organizations can obtain resources to provide high-quality services and improve their own service capabilities.