To　explore　the　influence　of　gap　on　deformation　and　deterioration　stress　of　track　structure,　a　finite　element　model　of　CRTS-I　slab　ballastless　track　with　gap　is　established　by　ABAQUS　on　the　basis　of　plastic　damage　constitutive　relation　of　concrete.　The　effects　of　different　sizes　and　different　positions　of　gap　on　displacement　and　stress　of　the　track　structure　are　calculated　and　analysed.　The　influence　law　of　gap　on　deformation　and　deterioration　stress　is　drawn　by　comparison　with　the　calculation　of　normal　track　structure.　The　results　show　that　increasing　gap　size　sharply　increases　vertical　displacement　of　both　rails　and　slab　and　also　seriously　deteriorates　transversal　and　longitudinal　stress　on　the　track　slab　to　a　great　extent.　Moreover,　the　effect　of　gap　at　slab　centre　on　deteriorated　stress　and　deformation　is　less　than　that　of　gap　at　slab　end.　The　study　can　obviously　provide　theoretical　reference　for　the　maintenance　standard.　©　2018　Inderscience　Enterprises　Ltd.