A　mathematical　model　is　developed　to　predict　the　volatile　organic　compound　(VOC)　emission　rate　from　building　materials.　The　mass　diffusion　and　convection　process　in　the　boundary　layer　between　material　surface　and　air　flow　are　considered　in　this　model.　The　predictions　made　by　model　are　validated　by　the　experimental　results.　The　results　indicate　that　there　is　a　good　agreement　between　the　model　predictions　and　experimental　results.　The　influences　of　air　flow　velocity,　temperature　on　VOC　emission　rate　are　discussed.　The　result　of　study　show　that　VOC　emission　rate　would　increase　with　the　increase　of　air　velocity　and　also　increase　in　the　chamber　with　higher　air　temperature　during　the　initial　period　of　emission　process.