In　this　work,　the　effects　of　ratio　of　monomer　to　cross-linker　(AM/MBAM)　and　solid　loading　on　the　microstructure　and　mechanical　properties　of　porous　Si3N4　ceramics　prepared　by　tert-butyl　alcohol　(TBA)-based　gel-casting　process　were　investigated.　It　was　found　that,　when　the　ratio　of　monomer　to　crosslinker　was　8,　and　the　solid　loading　was　50　wt%,　the　mechanical　properties　of　sintered　samples　were　the　most　excellent,　which　resulted　from　the　uniform　pore　size　distribution　and　well-grown　rod-like　beta-Si3N4　grains.　In　that　case,　the　porosity　and　flexural　strength　of　sintered　samples　were　50%　and　125　MPa,　respectively.　Copyright　(C)　2014,　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.　Published　by　Elsevier　Limited.　All　rights　reserved.