Almost　all　the　literature　correlations　for　predicting　the　minimum　spout-fluidizing　velocity,　umsf,　were　developed　from　single　particle　component　and　special　gas-distributor,　and　hence　have　some　limitation　in　actual　application.　In　view　of　this,　umsf　of　binary　particle　mixtures　were　determined　in　a　semi-cylindrical　spout-fluid　bed　of　125　I.D.　and　60°　conical　base　angle.　Since　bed　diameter　and　perforated　distributor　modes　affect　obviously　the　gas　dispersion　and　the　exchange　between　spout　and　annular　region　in　spout-fluid　beds,　four　functions,　i.e.,　cos(aθ),　sin(bθ),　tan(cβ)　and　f(Dc/Dcref),　were　proposed　to　represent　the　effects　of　conical　angle,　θ,　uniform　gas　distribution　style,　holes　orientation　angle,　β,　and　bed　diameter,　Dc,　on　umsf,　respectively.　Based　on　590　umsf　data　from　this　work　and　literatures,　six　dimensionless　numbers,　standing　for　bed　geometry,　particle　properties　and　momentum　at　minimum　spout-fluidizing　conditions,　and　the　above　four　functions　are　satisfactorily　used　to　develop　a　new　correlation　for　predicting　umsf　with　a　correlation　coefficient　0.97,　a　deviation　±29.5%　and　an　average　deviation　11.5%.