As　a　kind　of　magnesium　rich　material,　magnesium　olivine　has　been　proved　to　be　a　kind　of　artificial　wetland　substrate,　which　has　a　good　effect　on　phosphorus　removal.　Therefore,　it　selected　firing　of　the　magnesium　olivine　under　the　800　degrees　C,　1000　degrees　C,　1600　degrees　C　as　the　research　object.　The　characteristics　of　phosphorus　removal　were　investigated　and　compared.　The　experimental　results　show　that　the　adsorption　isotherm　equation　of　Langmuir　can　well　describe　the　adsorption　process　of　phosphate　on　the　magnesium　olivine　at　different　temperatures.　Its　phosphate　saturated　adsorption　capacity　was　195.65mg.kg(-1),　169.49　mg.kg(-1)　and　145.43　mg.kg(-1).　At　the　same　time,　all　kinds　of　magnesium　olivine　phosphorus　desorption　degree　is　low.　It　is　proved　that　the　performance　of　the　magnesium　olivine　with　low　temperature　is　better.　It　is　more　suitable　to　be　used　as　artificial　wetland　substrate.