Through　experiments　and　numerical　simulation　methods　a　study　has　been　conducted　of　the　characteristics　of　convection　heat　exchange　of　ridged　internal-finned　tubes　and　a　comparison　of　the　above　characteristics　with　the　flow　and　heat　transfer　characteristics　of　straight　internal-finned　tubes　is　performed.　The　experimental　results　indicate　that　the　heat　exchange　characteristics　of　ridged　internal-finned　tubes　are　better　than　those　of　straight　internal-finned　tubes　in　terms　of　intensified　heat　transfer　performance,　but　at　the　same　time　there　is　a　corresponding　increase　in　flow　resistance.　Through　the　adoption　of　a　turbulent　flow　model　capable　of　realizing　k-ε　equation,　the　flow　and　heat　transfer　process　of　ridged　internal-finned　tubes　have　been　simulated.　The　calculation　results　are　in　good　agreement　with　the　experimental　ones.　The　calculation　results　indicate　that　the　periodical　ridges　inside　the　finned　tubes　have　changed　the　distribution　of　the　inner-flow　fields　and　temperature　ones.　Relative　to　the　straight　internal-finned　tubes,　a　secondary　vortex　flow　has　emerged,　which　is　conducive　to　an　intensified　heat　exchange　and　plays　a　definite　destructive　role　to　the　flow　boundary　layer.　Meanwhile,　by　increasing　the　turbulent　kinetic　energy　of　the　flow　field,　the　temperature　gradient　in　the　neighborhood　of　the　heat　exchange　wall　surfaces　has　been　enhanced,　contributing　to　an　intensification　of　heat　transfer.