Wastewater　containing　Cadmium　ion　could　be　effectively　removed　by　hydroxyapatite　(HAP).　Experimental　results　indicated　that　Cd　removal　percentage　increased　by　increasing　HAP　dosage,　solution　pH,　and　reaction　time.　Cd　removal　percentage　could　approach　100%.　There　existed　two　stages　from　kinetic　point　of　view.　At　the　earlier　stage,　reaction　rate　was　so　fast　that　its　kinetic　process　was　intricate.　At　the　latter　stage,　the　rate　of　reaction　became　slow　and　the　process　of　reaction　accorded　with　first-order　kinetic　equation.　The　relationship　between　reaction　rate　constant　k1　and　temperature　T　accorded　to　Arrhenius　Equation,　and　the　activation　energy　of　sorption　(Ea)　was　6.075J/mol　and　frequency　factor　(A)　was　220s-1.　The　results　of　XRD,　FT-IR　and　SEM　ruled　out　the　possibility　of　occurrence　of　dissolution-　precipitation,　co-precipitation　during　the　removal　of　Cadmium　ions.　It　was　inferred　that　ion-exchange　governed　the　process　during　the　removal　of　Cd　by　HAP,　accompanying　with　adsorption.　©2010　IEEE.