This　study　focuses　on　the　main　factors　determining　the　apparent　porosity　of　porous　bioceramics　prepared　using　small　organic　foam　spheres　as　the　pore-making　reagent,　in　order　to　determine　the　best　technical　parameters　for　preparing　porous　bioceramics.　In　every　experiment,　only　one　of　these　factors　(the　time　of　heating,　the　sintering　temperature,　the　mass　ratio　between　small　organic　foam　spheres　and　beta-tricalcium　phosphate　(beta-TCP)　powder,　and　the　rate　of　the　temperature　rise)　was　changed,　while　the　others　were　kept　constant.　In　each　case　the　apparent　porosity　was　tested　and　the　relation　between　the　specific　variable　and　apparent　porosity　was　observed.　Finally,　the　optimum　technical　parameters　were　deduced.　The　apparent　porosity　shows　an　inverse　linear　relation　to　the　time　of　heating　and　the　sintering　temperature,　and　is　approximately　proportional　to　the　mass　ratio　between　the　small　organic　foam　spheres　and　the　beta-TCP　powder　and　the　rate　of　temperature　rise.　These　factors　have　important　influences　on　the　apparent　porosity.　The　optimum　conditions　were:　heating　time　(soak　time)　120　min,　sintering　temperature　850　degrees　C,　mass　ratio　0.25,　and　a　rate　of　temperature　increase　of　120　degrees　C　h(-1).