The　pumped　loop　heat　pipe　heat　exchanger　unit　for　cooling　consumes　low　power　and　has　a　high　coefficient　of　performance　(EER).　For　optimization　applications　at　small　data　centers,　this　paper　investigated　the　operating　performance　of　the　pumped　loop　heat　pipe　heat　exchanger　unit　used　in　as　mall　data　center.　The　EER　under　different　outdoor　temperatures　was　analyzed,　and　the　fitted　operating　characteristic　curve　showed　that　EER　varied　with　outdoor　temperature.　An　energy　sa　ving　analysis　was　done　with　the　f　itt　ing　curve,　and　the　total　energy　consumption　was　calculated　at　each　temperature　interval　in　Beijing.　The　results　show　that　in　transitional　and　winter　season,　when　the　outdoor　temperature　is　below　15°C,　the　pumped　loop　heat　pipe　heat　exchanger　unit　can　be　turned　on　to　bear　part　or　total　thermal　load　and　performs　well　in　energy　saving.　Compared　to　the　air　conditioning　and　refrigeration　system　for　cooling,　the　energy　saving　can　reach　at　least　35.76%.