The　mechanism　for　thermosolutal　convection　and　the　Coupling　effects　of　flow,　temperature　and　solute　fields　during　the　vertical　Bridgman　growth　of　Hg1-xCdxTe　single　crystals　have　been　numerically　analyzed.　The　calculations　take　into　account　the　thermophysical　properties　and　their　dependence　on　temperature　and　composition.　The　results　show　that　there　are　two　main　thermal　convection　cells　in　the　melt　caused　by　two　temperature　gradients　during　the　growth　of　Hg1-xCdxTe　single　crystals.　The　stabilizing　axial　solute　gradient　in　the　melt　will　significantly　damp　the　thermal　convection　cells　when　the　absolute　value　of　the　solute　Rayleigh　number　is　close　to　the　value　of　the　thermal　Rayleigh　number.　When　there　is　a　large　solute　gradient　in　the　melt,　the　thermosolutal　convection　will　become　unstable,　and　the　upper　flow　cell　will　evolve　into　a　two-cell　flow　pattern.　During　the　growth　of　Hg1-xCdxTe　single　crystals,　the　radial　solute　segregation　in　the　melt　develops　non-monotonically　with　two　minima　values.　Thus,　the　methods　that　solely　aim　at　either　damping　or　enhancing　the　thermosolutal　convection　are　not　always　able　to　improve　the　radial　solute　segregation.　(C)　2008　Elsevier　B.V.　All　rights　reserved.