In　a　groundwater　plant,　removal　of　iron,　manganese,　and　ammonia　nitrogen　was　performed　via　a　purification　process　using　a　filter　column　at　a　low　temperature　(5-6).　Iron,　manganese　and　ammonia　[Fe()　0-19.26　mg•L-1,　Mn()　0.52-2.05　mg•L-1,　and　NH4+-N　0.37-2.59　mg•L-1]　were　analyzed　to　explore　the　ammonia　nitrogen　removal　efficiency　under　different　iron　and　manganese　concentrations.　The　results　showed　that　when　the　concentration　of　manganese　in　the　inlet　water　was　maintained　at　approximately　0.6　mg•L-1　and　the　concentration　of　ferrous　iron　in　the　inlet　water　was　increased,　with　the　increase　of　iron　oxides　in　the　filter　layer,　the　ratio　of　ammonia　nitrogen　removed　by　adsorption　of　iron　oxides　increased,　while　the　ratio　of　ammonia　nitrogen　removed　by　nitrification　will　decreased　and　adsorption　preceded　nitrification.　When　the　concentration　of　ferrous　iron　in　the　water　was　maintained　at　approximately　8　mg•L-1and　11　mg•L-1,　and　the　concentration　of　manganese　in　the　water　was　increased,　the　proportion　of　ammonia　nitrogen　removed　by　adsorption　did　not　increase　with　the　increase　of　manganese　oxide,　and　the　removal　route　of　ammonia　nitrogen　hardly　changed.　This　is　because　less　manganese　oxides　were　formed　20　cm　before　the　filter　layer,　which　had　little　effect　on　the　ammonia　nitrogen　adsorbed　in　this　range.　The　production　area　of　manganese　oxides　was　concentrated　below　20　cm　of　the　filter　layer,　and　most　ammonia　nitrogen　was　removed　by　adsorption　and　nitrification　before　this　area,　and　the　manganese　oxides　in　this　area　did　not　adsorb　ammonia　nitrogen.　©　2020,　Science　Press.　All　right　reserved.