Three　dimension　numerical　simulations　were　performed　on　laminar　flow　and　heat　transfer　in　a　microchannel　with　interrupted　fan-shaped　reentrant　cavities.　In　contrast　to　this　proposed　microchannel,　the　corresponding　conventional　rectangular　microchannel　was　chosen.　The　numerical　results　indicate　that　the　overall　pressure　drop　effectively　reduce　and　the　ratio　of　friction　coefficient　is　less　than　1　because　of　interrupted　zones.　The　performance　of　heat　transfer　is　significantly　affected　by　the　length　of　interrupted　zones.　As　the　interrupted　length　increases,　heat　transfer　decreases　obviously.　Then,　according　to　the　heat　enhancement　factor,　(Nu/Nu0)/(f/f0)0.2909,　the　No.1　and　No.2　channel　both　have　better　overall　performance　than　rectangular　microchannel　when　Re>200.