Hydrogel　is　one　of　typical　smart　materials　and　has　been　used　in　many　engineering　applications,　such　as　flexible　electronics,　flexible　robots,　and　biomedical　engineering.　Modern　industries　with　complex　working　environments　require　hydrogel　to　have　higher　strength　without　losing　flexibility.　Many　published　experimental　studies　focus　on　the　preparation　technique　of　hydrogel　composite　with　high　strength　and　toughness.　However,　the　theoretical　investigation　into　the　influence　of　entanglements　on　the　hydrogel　deformation　is　rarely　reported　for　the　structure　analysis　and　deformation　mechanism　of　hydrogel　composite,　as　a　purpose　to　design　of　hydrogel　devices.　In　this　paper,　the　constitutive　model　is　developed　for　thermal　responsive　hydrogel　with　chain　entanglements,　based　on　Flory-Rehner　theory　and　slip-link　model,　and　numerically　solved　by　a　user　subroutine　in　ABAQUS.　The　uniaxial　tensile　and　compressive　simulations　of　standard　specimens　are　carried　out　to　validate　the　proposed　model　and　demonstrate　the　applicability　of　the　hydrogel　composite,　in　which　a　great　agreement　is　obtained　by　comparing　the　simulation　results　to　the　experimental　data　from　published　work.　Subsequently,　the　hydrogel　composites　with　three　types　of　structure,　such　as　hydrogel　grippers,　scaffolds　and　skins,　are　designed　to　improve　the　overall　strength　and　maintain　the　flexibility　of　the　devices,　inspired　by　the　deformation　mismatch　characteristics　of　multilayer　hydrogels.　The　results　show　that　the　properties　of　composite　hydrogels　are　closely　related　to　the　level　of　entanglements,　cross-link　and　composite　structures.　This　work　may　contribute　to　the　preparation　of　reinforced　hydrogels　and　provide　insights　for　the　design　of　hydrogel　multifunctional　devices.