We　pay　attention　to　homogeneity　of　the　material　as　one　of　the　methods　of　reducing　the　life　variance　of　castable．The　relationship　between　flow　characteristic　of　finer　particle　fraction，fluidity　of　the　castable，homogeneity　of　the　castable　was　investigated　in　order　to　develop　the　homogeneous castable．Yield　stress（Y）　and　plastic　viscosity（η）　of　finer　particle　fraction　and　aggregate　migration length（R）　and　time（T）　of　castable　were　measured．The　ratio　η／Y　and　R／T　as　flow　index　were calculated．The　η／Y　and　R／T　have　maximal　point　as　a　function　of　water　addition． Before　and　after the　maximal　point， finer　particle　fraction　became　agglutination　or　separation． Yield　stress　and　plastic viscosity　increased　by　thickening　agent　and　fumed silica． It　showed　the　increase　of　plastic　viscosity was　larger　than　that　of　yield　stress　because　of　the　increase　in η／Y． Moreover　it　has　been　eiucidated that　there　is　a　relationship　between　the　flow　characteristic　of　the　finer　particle　faction　and that fluidity　of　the　castable　because　there　is　a　correlation　between η／Y　and R／T．

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