The　structure　and　basic　principle　of　heat　pipe　and　plate　micro　heat　pipe　array　are　introduced　in　detail,　and　the　application　of　FLUENT　grid　technology　and　numerical　technique　is　introduced.　The　thermal　conductivity,　the　phase　change　and　the　effect　of　the　liquid　filling　rate　on　the　heat　transfer　performance　of　the　heat　pipe　were　simulated　by　using　FLUENT　of　CFD　software.　The　results　show　that　when　the　liquid　filling　rate　is　20%　similar　to　30%,　the　thermal　conductivity　of　the　micro　heat　pipe　starts　to　rise,　reaching　6.11　x　10-5　W　.　m-2　at　the　highest　level.　When　the　liquid　filling　rate　of　30%　to　40%,　the　thermal　conductivity　of　the　micro-heat　pipe　began　to　decline,　which　indicates　that　the　best　filling　rate　is　when　the　liquid　filling　rate　is　20　similar　to　30.　When　the　temperature　of　the　outer　wall　of　the　condensation　section　is　67.5　degrees　C,　the　maximum　heat　flux　can　reach　8.1　x　105　W　x　m-2.