The　solubilization　of　naphthalene,　anthracene　and　pyrene,　in　both　F127　and　P123　aqueous　micellar　solutions　has　been　characterized　by　UV　method.　These　aromatic　hydrocarbons　were　confirmed　to　incorporate　in　the　micellar　cores.　The　model　of　stepwise　association　equilibrium　was　used　to　analyze　the　experimental　results　and　the　first　stepwise　association　constant　K-1　between　solubilizate　monomer　and　vacant　micelle　was　thus　obtained.　It　was　found　that　the　values　of　K-1　increased　with　increasing　the　benzene-cycle　number　of　the　aromatic　hydrocarbons.　The　average　number　of　solubilizating　molecules　corresponding　to　each　PO-group　in　the　mcellar　cores　was　verified　to　be　consistency　for　both　F127　and　P123.　This　result　suggests　that　the　volume　of　the　micellar　core　is　an　important　factor　to　determine　the　amount　of　aromatics　incorporating　into　Pluronic　micelles,　The　amount　was　lineally　enhanced　with　increasing　the　volume　of　the　micellar　core.　The　stability　in　planar-ring　of　the　molecule　of　polycyclic　aromatic　hydrocarbon　also　affected　its　solubilization,　It　was　shown　by　the　solubilization　isotherms　that　anthracene　and　pyrene　have　a　higher　efficiency　in　solubilization　compared　with　naphthalene.