The　discrete　element　method　(DEM)　was　used　to　establish　the　slump　model　and　J-Ring　model　of　concrete　to　describe　the　flow　behavior　in　the　slump　test　and　J-Ring　test.　Then,　the　contact　parameters　of　particle-particle　and　particle-geometry　for　the　concrete　DEM　model,　including　restitution　coefficient,　rolling　friction　coefficient,　static　friction　coefficient,　and　surface　energy,　were　measured.　In　order　to　avoid　the　influence　of　the　shape　and　size　of　the　aggregate,　this　paper　used　high-precision　glass　spheres　as　the　aggregate　of　the　concrete　for　meso-calibration　test,　slump　test,　and　J-Ring　test.　Comparing　the　simulation　results　of　DEM　model　with　slump　test　result,　a　very　high　agreement　between　the　initial　stage,　the　rapid　flow　stage,　and　the　slow　flow　stage　of　the　slump　flow-time　curve　can　be　found　as　well　as　the　final　slump　and　slump　flow.　Moreover,　similar　to　the　slump　DEM　model,　the　DEM　models　of　J-Ring　test,　V-funnel　test,　and　U-channel　test　were　established　to　study　the　passing　ability　and　filling　ability　of　concrete　with　outstanding　accuracy.　Therefore,　the　concrete　DEM　model　with　contact　parameters　and　JKR　model　can　be　adopted　to　study　the　flow　behavior　of　the　fresh　concrete.