Iron-aluminum　composited　adsorbent　was　prepared　by　co-precipitation　method　and　the　influence　of　phosphorus　concentration,　pH　value,　temperature　and　interfering　ions　to　phosphorus　removal　were　studied.　The　results　showed　that　the　adsorbent　possess　remarkable　effects　on　phosphorus　removal.　With　increased　phosphorus　concentration,　adsorption　capacity　of　the　adsorbent　kept　a　renarhed　growth.　In　the　same　conditions,　the　adsorption　capacity　of　the　adsorbent　was　3.5　times　compared　with　that　of　activated　alumina.　Phosphorus　adsorption　remained　mainly　chemical　adsorption.　There　were　simultaneously　non-special-adsorption　and　strong　special-adsorption　in　the　adsorbent　surface.　CO32-　had　significant　effect　in　the　phosphorus　removal　of　the　adsorbent.　There　existed　competitive　adsorption　between　CO32-　and　PO43-　on　the　particle　surface.