The　mechanical　behavior　of　concrete　is　directly　related　to　its　gradation　and　aggregate　content.　An　appropriate　random　aggregate　model　is　the　basis　for　successfully　simulating　the　meso-mechanical　behaviors　of　concrete.　A　method　for　simulating　full-graded　aggregate　concrete　with　high　aggregate　content,　which　can　efficiently　pack　the　spherical　aggregates,　is　proposed.　Based　on　this　model,　a　3-D　random　convex　polyhedron　aggregate　model　considering　the　actual　aggregate　content,　gradation　and　shape　of　aggregate　is　established.　Furthermore,　the　method　for　identifying　the　properties　of　the　meso-elements　is　investigated　and　the　meshing　codes　are　designed　to　automatically　generate　the　meso-scale　structured　grids　of　concrete.