The prerequisite for enhancing the capacity of archival advisor service is recognizing the constituent elements and their interactive mechanisms in archival advisor services.This paper selects the social mechanisms driving archival advisor services as the research question and aims to reveal the mechanisms behind the occurrence of archival advisor services.Using the mechanism explanation model of the DBO theory and based on the analysis framework of motivations and interactive opportunities between archival institutions and public decision-making bodies,three specific mechanisms of archival advisor services are constructed:duty-based interactive mechanism,developmental communication mechanism,and value co-creation integration mechanism.Through process tracing of archival work cases related to significant events and emergencies,the operation and characteristics of these three mechanisms of archival advisor services are validated and analyzed,with the aim of further optimizing and strengthening the mechanisms.