Struvite　precipitation　in　sludge　dewatering　filtrate　was　achieved　in　a　lab-scale　sequencing　batch　reactor.　The　influence　of　the　operational　conditions　on　the　struvite　precipitation　process　has　been　studied.　These　operational　conditions　include　stirring　rate　of　the　reactor,　reaction　time　and　sedimentation　time.　Experiments　indicated　that　stirring　rate　of　the　reactor　within　50　rpm　to　250　rpm　had　no　strong　influence　on　the　formation　of　struvite.　As　reaction　time　increased,　there　was　a　slight　positive　effect　on　the　removal　of　Mg2+,　NH4+　and　PO43-.　Suggested　reaction　time　is　40-80　minutes　based　on　our　experiments.　In　order　to　obtain　the　lower　turbidity　and　the　lower　PO43-　concentration　in　the　decanting　filtrate　of　the　batch　reactor,　the　minimum　sedimentation　time　should　be　more　than　30　minutes.