Starting　from　the　non-continuum　mechanics,　a　meso　element　equivalent　model　was　proposed　to　simulate　the　failure　process　of　concrete.　The　equivalent　mechanical　behaviors　of　concrete　meso　element　were　deduced　theoretically　and　verified　by　numerical　simulation.　Based　on　the　meso　element　equivalent　model,　the　failure　process　and　macro　mechanical　properties　of　wet-screened　concrete　under　uniaxial　tensile　were　simulated　with　the　extended-finite　element　method.　And　the　results　of　meso　element　equivalent　model　were　compared　with　those　of　random　aggregate　model.　The　results　indicate　that,　compared　with　random　aggregate　model,　the　degrees　of　freedom　of　the　structural　system　decrease　greatly,　and　the　crack　propagation　path　and　the　macroscopic　mechanical　properties　obtained　from　the　meso　element　equivalent　model　are　consistent　with　the　random　aggregate　model,　which　reflects　the　accuracy　and　efficiency　fully　of　the　mechanical　model.