Transport　performance　of　near-surface　concrete　is　a　main　factor　affecting　the　durability　of　concrete　structures.　Meso-structure　of　near-surface　concrete　and　its　effect　on　permeability　were　investigated.　The　near-surface　concrete　was　divided　into　several　layers,　and　by　considering　the　dilution　effect,　the　tortuous　effect,　and　the　interfacial　transition　zone　effect　on　permeability　caused　by　aggregates,　together　with　hardened　paste　permeability,　a　computational　frame　for　permeability　determination　of　near-surface　concrete　was　established.