Abstract: The county and district administrative examination and approval bureaus serve as the organizational basis for the coordinated advancement of the grassroots “decentralization，management and service” reform，and it is an important task to actively explore cross-departmental and cross-level collaboration. Constructing an interpretation framework for service innovation of the Administrative Approval Bureau of J Province G District from the three dimensions of cross-departmental collaboration context，coordination mechanism, and coordination efficiency：due to changes in intergovernmental relations such as resource transfer, organizational establishment，and organizational reform，new coordination mechanisms and structural mechanisms have been created Promote cross-departmental collaboration in G District from both dynamic and static aspects with the procedural mechanism，but the synergy efficiency has not reached the ideal state. Service integration has failed to resolve the problems of target deviation and division of powers and responsibilities，and reduced the consistency of interests of the cooperating subjects; technical tools also restricted by interest barriers between departments，it is difficult to improve the ability to apply technology；the uncertainty of the bureaucratic personal relationship network and the phased characteristics of collaborative authority weaken the ability to coordinate conflicts. Standardized synergy built around the management system，rule system and platform construction，and application synergy built by focusing on governance bodies，governance tools，and governance objects are important ways to improve the effectiveness of synergy.

Key words: Administrative Approval Bureau, cross-departmental collaboration, collaborative effectiveness, collaborative dilemma