In　this　paper,　a　2-D　tidal　river　flow-sediment　mathematical　model　is　established　by　irregular　triangular　element　calculation　mesh　and　finite　element　numerical　method.　And　verification　is　done　through　the　comparison　of　measured　value　and　the　calculated.　The　good　agreement　of　calculate　results　and　measured　values　is　obtained.　This　mathematical　model　could　be　used　in　the　river　regulation　works　in　Mingjiang　River.