[Purpose/significance] This paper aims to discuss,the behavior subject composition, roles construction and role functions setting in Chinese public digital cultural resources integration projects, to provide some reference for similar projects to construct.[Method/process] This research firstly teases out the logic relationships of some concepts under a conception framework of role expectation of the Social Role Theory, which include setting and assignment of role expectation and setting and assignment of role function Then, based on analysis of related literatures and government documents, it designs the interview outline and survey questionnaire of role expectation, conducts an investigation on practitioners of public cultural institutes, and summarizes, analyzes and discusses the interview results and questionnaire.[Result/conclusion] In Chinese public digital cultural resources integration projects, public institutes are more willing to cooperate with those in the same administrative levels. Roles assignment should be on the basis of Schema of Informational Development by Ministry of Culture (2013-2020) which is a government official document, the role expectations of all practitioners be considered to, all agents be assigned with appropriate roles, and the harmonization and mediator effect of the third institute be emphasized . Based on all the above, it suggests that the role functions should be expanded in details according the existing role assignment.