To　examine　the　effects　of　fluid　pressure　on　effective　properties　of　solids　with　closed　pores,　a　new　micromechanical　model　has　been　developed　to　investigate　the　coupling　effect　between　the　macroscopic　deformation　and　the　pore　pressure.　In　the　proposed　micromechanical　model,　the　internal　pressure　is　generated　by　applying　eigenstrain　in　the　domain　occupied　by　the　fluid　phase.　The　effective　properties　have　been　obtained　with　the　use　of　Eshelby-Mori-Tanaka　equivalent　inclusion　method.　Analytical　results　are　verified　against　those　from　finite　element　solutions　and　a　good　agreement　is　achieved.　The　results　show　the　overall　effective　bulk　modulus　depends　on　the　property,　the　volume　fraction　and　the　internal　pressure　of　fluid　inclusions.　The　fluid　pressure　can　strengthen　the　overall　effective　bulk　modulus,　but　it　has　no　contribution　to　the　overall　effective　shear　modulus.