The concept of co-construction and sharing is an important idea to guide the development of archives in China in the new situation,and voluntary service is an important way for the public to participate in the construction of archives. This paper makes a questionnaire survey on the public participation in voluntary service activities of archives in China. The results showed that the number of the public participation in archival voluntary service is very small,and the participation rate is very low; the participants are mainly women,as well as the age is mainly between 21 and 40 years old,and the participants are mainly staff of public institutions, students and administrative staff,etc.; the overall cultural level of the participants is relatively high,and the number of participants in the central and eastern regions is higher,but the total number of participation is relatively small,and mainly concentrated upon the festival and holiday. Most voluntary service activities are carried out in the archives and public places such as square parks. The access for the public to obtain information about archival voluntary service activities is relatively single,mainly through documents notification,network broadcasting and television channels. Most of the samples think that we should expand the activities and contents of archival voluntary service,as well as actively use all kinds of new media platforms to popularize it and speed up the construction of guarantee and incentive system at the same time. Finally,under the guidance of the concept of co-construction and sharing,the author puts forward some suggestions for promoting the archival voluntary service activities,including trying to expand voluntary activities,constantly enriching the service content and projects; multi-platform,multi-channel co-construction and strengthen the linkage promotion; building a voluntary service mechanism based on the public demand to share service achievements and benefits.