In　order　to　test　and　verify　the　heat　radiation　of　the　CPU　heat　sink,　the　authors　have　conducted　a　thermal　simulating　analysis　on　the　basis　of　ANSYS　program　of　finite　element　method　(FEM).　Temperature　distributions　of　a　normal　CPU　heat　sink　and　the　CPU　heat　sink　with　heat　pipe　in　the　conditions　of　room　temperature　and　natural　convention　have　been　acquired.　The　results　show　that　the　surface　temperature　of　CPU　can　be　reduced　efficiently　with　a　heat　pipe　heat　sink.