The　density　of　epilithic　algae　and　concentration　of　chlorophyll　a,　Shannon-Wiener　index　and　primary　productivity　were　chosen　to　study　the　river　continuum　characteristics　of　Xiangxi　River.　The　results　showed　that　in　general,　the　algal　density,　chlorophyll　a　concentration　and　Shannon-Wiener　index　tended　to　be　increased　with　increasing　stream　order,　but　this　trend　was　not　very　evident　in　the　first　three　orders　and　even　reversed.　The　primary　productivity　was　also　higher　in　the　higher　than　that　in　the　lower　stream　orders,　and　reached　the　maximum　in　the　fourth　order,　then　decreased　slightly.　The　ratio　of　gross　primary　productivity　to　community　respiration　was　the　highest　in　the　first　stream　orders,　which　means　autochthonous　productivity　was　dominant　in　the　river.　The　results　did　not　absolutely　tally　with　the　RCC　forecast,　therefore,　we　can　conclude　that　Xiangxi　River　had　been　undergone　anthropogenic　influence.