In recent years，with the growing number of registered volunteers of national public library，the participation of library volunteer service and acceptance of volunteerism have been enhanced，the number of voluntary organizations have grown rapidly，and organization and institutionalization construction has become more strengthened，which have provided a good social foundation and organizational guarantee for the further development of voluntary service. However，the most of libraries pay little attention and understanding on volunteer management which doesn’t forms normalization. A long-term management mechanism isn’t built，a systematic connection between libraries isn’t established，neither. This article makes a preliminary study of public library management mode of volunteer service.