By　using　two　different　reagents　as　the　starting　materials,　SrMnO3　Crystallines　with　two　different　morphologies　rhombus-like　and　rod-like,　have　been　directly　synthesized　by　hydrothermal　conditions.　The　effects　of　the　hydrothermal　parameters　on　the　quality　of　the　SrMnO3　samples　were　given　for　the　fist　time.　And　a　preparative　mechanism　for　the　formation　of　different　morphologies　using　different　reagents　during　the　hydrothermal　reaction　has　been　discussed.　(C)　2007　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.