The　macroscopic　mechanical　behaviors　of　concrete　are　dependent　on　its　meso-structure　and　components,　and　pore-water　should　have　a　significant　effect　on　the　mechanical　properties　of　wet　concrete.　At　the　meso-scale,　unsaturated　concrete　is　assumed　to　be　a　multi-phase　composite　composed　of　concrete　matrix,　saturated　pore-water,　dry　and　unsaturated　pores.　A　two-step　mechanical　homogenization　technique　is　introduced　for　evaluation　of　the　global　mechanical　properties　of　unsaturated　concrete.　Based　on　the　homogenization　model,　the　quantitative　relationships　are　derived　between　concrete　porosity,　saturation　and　the　macro-mechanical　properties　including　the　modulus　of　elasticity,　Poisson＇s　ratio,　the　effective　tensile　strength　and　peak　tensile　strain　of　unsaturated　concrete.　A　comparison　between　the　present　theoretical　results　and　Yaman　et　al.＇s　experimental　ones　in　the　extreme　state　indicates　that　the　proposed　approach　is　applicable　to　predict　the　effective　mechanical　properties　of　wet　concrete.　Moreover,　it　can　be　concluded　that　the　modulus　of　elasticity,　Poisson＇s　ratio,　tensile　strength　and　peak　tensile　strain　of　unsaturated　concrete　increase　as　the　degree　of　saturation　increases;　the　peak　tensile　strain　of　wet　concrete　with　higher　saturation　decreases　with　increasing　the　porosity,　while　that　with　lower　saturation　increases　as　concrete　porosity　increases.