In　an　era　marked　by　increasingly　complex　risks　and　extreme　disasters,　nations　are　progressively　leaning　towards　inter-organizational　collaboration　as　a　means　to　adapt　and　respond　effectively.　Guided　by　the　principles　of　holistic　governance　and　comprehensive　emergency　management,　the　establishment　of　comprehensive　coordination　institutions　has　emerged　as　a　vital　strategy　for　enhancing　a　country＇s　emergency　response　capabilities.　Nevertheless,　the　transformation　of　inter-organizational　cooperation　networks　following　institutional　reform　remains　shrouded　in　ambiguity.　This　research,　employing　a　blend　of　quantitative　and　qualitative　analyses　within　a　network　theory　framework,　delves　into　the　shifts　within　inter-organizational　cooperation　networks　subsequent　to　institutional　reform.　By　scrutinizing　the　evolution　of　emergency　plan　networks　at　provincial,　municipal,　and　county　levels　before　and　after　China＇s　institutional　reform　and　drawing　insights　from　emergency　plan　revision　personnel,　this　study　unveils　a　noteworthy　trend.　Specifically,　the　inter-organizational　collaboration　network　in　China＇s　emergency　management　sector　has　gravitated　towards　a　unified　command　model,　fostering　heightened　cross-functional　cooperation　and　optimizing　network　structure.　The　findings　of　this　study　not　only　shed　light　on　the　post-reform　dynamics　of　inter-organizational　cooperation　networks　in　China　but　also　offer　valuable　insights　for　other　countries　and　regions　seeking　to　develop　effective　emergency　management　systems.　As　the　global　landscape　continues　to　evolve,　understanding　and　adapting　to　these　changes　in　network　dynamics　becomes　imperative　for　bolstering　disaster　response　capabilities　worldwide.　©　2023　Elsevier　Ltd