The　coupling　effect　of　heat　absorption　and　release　exists　in　the　thermal　decomposition　of　a　few　chemical　materials.However,the　impact　of　the　above　coupling　on　thermal　hazard　assessment　is　not　considered　in　the　literature　studies.In　this　work,nitroguanidine(NQ)and　1,3,5-trinitro-1,3,5-triazine(RDX)are　selected　as　representative　materials　to　explore　the　influence　of　the　coupling　effect　on　the　thermal　hazard　assessment　of　chemical　materials.The　linear　heating　experiments　of　NQ　and　RDX　are　carried　out　by　a　microcalorimeter　and　synchronous　thermal　analyser.The　thermal　decomposition　curves　are　decoupled　by　advanced　thermokinetics　software.The　thermal　decomposition　and　kinetic　parameters　before　and　after　decoupling　are　calculated.The　results　of　TG　experiment　show　that　both　NQ　and　RDX　began　to　lose　mass　during　the　endothermic　stage.The　endothermic　melting　and　exothermic　decomposition　of　NQand　RDX　are　coupled　within　this　stage.The　coupling　effect　has　different　degrees　of　influence　on　its　initial　decomposition　temperature　and　safety　parameters.Compared　with　the　parameters　in　the　coupling　state,the　initial　decomposition　temperature　and　adiabatic　induction　period　after　decoupling　decrease.The　self-accelerating　decomposition　temperature　increases,and　internal　thermal　runaway　time　decreases.In　the　thermal　hazard　assessment　of　chemical　materials　with　coupling　effects,the　calculated　parameters　after　decoupling　should　be　taken　as　an　important　safety　index.