In　order　to　qualitative　and　quantitative　study　on　tube　in　insertion　torsional　belt　of　strengthening　heat　transfer　mode,　to　establish　double-pipe　heat　exchanger　model　of　heat　transfer　enhancement　for　twisted-tape　inserts　in　tubes　with　air　for　heat　transfer　medium　and　to　study　by　numerical　simulation,　compared　with　experimental　result,　the　deviation　of　simulation　result　and　experimental　result　is　less　than　2%　in　Re　＞5000,　therefore　can　be　verificated　mathematical　model　of　correctness.　From　insertion　twisted　strip　tube　and　smooth　tube　velocity　and　temperature　of　comparison　graph　can　be　seen　twisted　strip　of　strengthening　heat　transfer　effect,　and　qualitative　describes　twist　ratio　and　frictional　resistance　coefficient　and　heat　transfer　effect　of　the　numerical　relations.