The　hydrolysis　and　acidification　of　waste　activated　sludge　were　investigated　under　three　types　of　alkaline　conditions,　i.e.　NaOH,　Na3PO4　and　combination　of　NaOH　and　Na3PO4.　Temperature　and　pH　were　controlled　at　35°C　and　10　respectively　for　all　alkaline　conditions　investigated.　Then　the　recovery　of　ammonia　and　phosphorus　from　the　three　types　of　alkaline　fermentation　liquid　was　conducted.　Finally,　the　cost　for　recovering　carbon　source,　ammonia　and　phosphorus　was　checked.　The　results　show　that　the　hydrolysis　and　acidification　abilities　of　WAS　under　the　three　types　of　alkaline　conditions　are　similar.　Whereas,　the　molar　ratio　of　phosphorus　and　ammonia　is　close　to　1:1　under　the　alkaline　condition　which　is　controlled　by　combination　of　NaOH　and　Na3PO4,　which　benefits　ammonia　and　phosphorus　recovery　in　the　form　of　struvite.　The　ammonia　and　phosphorus　recovery　efficiencies　are　equivalent　when　pH　values　are　controlled　by　NaOH　and　combination　of　NaOH　and　Na3PO4.　However,　the　cost　for　recovering　carbon　source,　ammonia　and　phosphorus　is　the　least　when　pH　is　controlled　by　combination　of　NaOH　and　Na3PO4.　The　process　of　recycling　carbon　source,　phosphorus　and　ammonia　from　waste　activated　sludge　can　be　optimized　by　fermenting　waste　activated　sludge　at　the　combination　of　NaOH　and　Na3PO4　condition.