This　article　first　develops　the　definition　of　software　project　cost　risk　and　the　efficiency　of　software　project　risk　resolution　strategy　combination,　then　taking　the　efficiency　as　the　selection　criteria,　proposes　an　optimal　model　for　choosing　software　project　cost　risk　resolution　strategy　combination　based　on　the　COCOMOII　model.　The　model　can　provide　us　suggestions　of　how　to　select　the　appropriate　software　project　cost　risk　resolution　strategy　combination　at　the　stage　of　software　project　risk　planning.　Finally　an　example　was　given　to　prove　the　practicability　and　feasibility.　©2009　IEEE.