Analytical　solution　is　obtained　of　coupled　laminar　heat-mass　transfer　in　a　tube　with　uniform　heat　flux.　This　corresponds　to　the　case　when　a　layer　of　sublimable　material　is　coated　on　the　inner　surface　of　a　tube　with　its　outer　surface　heated　by　uniform　heat　flux　and　this　coated　material　will　sublime　as　gas　flows　throught　the　tube.　©　1992　Science　Press.