Using　the　CFX　software,　the　flow　and　heat　transfer　characteristics　of　air　in　serpentine　cooling　channel　was　numerical　simulated,　and　the　computational　model　as　well　as　the　method　was　proved.　The　applicability　of　turbulence　model　was　also　compared　and　chosen.　Based　on　the　above,　the　flow　and　heat　transfer　characteristics　of　steam　in　serpentine　cooling　channel　were　numerical　simulated;　the　effects　of　steam　overheat,　rib　tabulators　angles　and　V-type　rib　tabulators　on　flow　and　heat　transfer　were　analyzed.　The　results　show　that　the　computational　results　by　using　SSG　turbulence　model　is　better　consistent　with　the　experimental　values;　The　steam　overheat　has　little　effect　on　the　heat　transfer.　Compared　with　smooth　channels,　ribbed　channels　reduce　the　impact　of　the　turn.　The　heat　transfer　effect　of　V-type　rib　tabulators　is　better　than　that　of　the　parallel　type.