In　this　paper,　the　rheological　mechanism　of　fresh　concrete　material　was　investigated　and　the　method　of　evaluating　its　rheological　property　was　optimized　by　combining　the　slump　test　of　five　groups　of　fresh　concrete　and　lattice　Boltzmann　method　(LBM).　The　rheological　parameters　of　fresh　concrete　samples　based　on　HerschelBulkley　(H-B)　model　and　Bingham　model　were　obtained　by　rheometer　and　equation　derivation　with　nonlinear　and　linear　fitting　approaches.　The　comparison　of　Bingham　and　H-B　models　in　the　simulation　results　of　the　slump　test　demonstrated　that　the　H-B　model　was　more　accurate　in　expressing　the　rheological　characteristics　of　the　fresh　concrete.　In　the　Bingham　model,　the　errors　of　slump　s,　spread　sf　and　the　time　of　spread　reaching　500　mm　T500　ranged　from　2.00%　to　39.29%.　The　errors　of　s　and　sf　in　the　H-B　model　were　less　than　2%,　and　the　error　of　T500　was　about　5%.　Afterwards,　the　results　of　the　slump　test　were　predicted　based　on　the　H-B　model.　The　effects　of　rheological　parameters　(power-law　index　consistency　index　and　yield　stress)　on　velocity,　viscosity,　shear　strain　rate,　flow　rate　and　external　contour　were　revealed.