Jiulong　River　has　been　polluted　to　varying　degrees.　The　water　environmental　quality　will　decrease　sharply　when　the　quantity　of　pollutant　and　waste　exceeds　the　consumption　capacity.　Thus,　It　is　of　great　significance　to　evaluate　the　water　environment　consumption　capacity.　We　put　forward　a　consumption　capacity　assessment　model　and　a　new　calculation　unit　so-called　landscape　watershed　unit.　The　water　environment　pollution　consumption　capacity　is　calculated　based　on　the　landscape　watershed　unit　and　the　administrative　unit　respectively.　The　results　tend　to　polarize　according　to　landscape　watershed　unit.　The　results　reflect　the　water　environment　consumption　potential　well,　which　pointed　out　that　the　environment　of　most　of　the　area　in　the　Jiulong　river　is　in　a　certain　acceptance　potential　of　Chemical　oxygen　demand　(COD)　and　ammonia　nitrogen,　while　in　some　important　local　urban　areas,　potential　consumption　capacity　is　close　to　saturated　condition.