The efficacy of devolution for separatism has long been a subject of concern and discussion.In order to further investigate the internal logic between the two,this paper selects France and Italy as cases,and finds out the following through the analysis of the decentralization types and institutional absorption capacity of the two countries:decentralization that focuses on the administration is more conducive to curbing the growth of separatism,while asymmetric models are better than symmetric models to meet the political demands of different regions,especially when traditional political ties and constraints shaped by electoral system do not work;when local elites can be effectively absorbed into the central government to participate in the governance of the country,separatist sentiment in the region will be greatly weakened,whether this participation is achieved through political negotiation(granting government posts or incorporating their views into relevant policies)or through party alliances(at the national or regional level).It is precisely because of the interaction of decentralization and institutional absorption that the effectiveness of governance on separatism is guaranteed.