In　this　study,　experimental　investigations　regarding　the　heat　transfer　performance　of　an　evaporator　with　capillary　wick　are　presented.　The　capillary　wick　structure　is　composed　of　sintered　multilayer　copper　mesh.　The　multilayer　copper　mesh　was　sintered　on　the　copper　plate.　With　different　combinations　of　mesh　screens,　the　wick　thickness　of　mesh　140　ranged　from　0.6　to　1.0　mm,　and　those　of　meshes　60　and　140/60　were　both　1.0　mm.　The　operating　pressures　used　in　this　study　were　0.86　x　10(5),　0.91　x　10(5),　0.96　x　10(5),　1.01　x　10(5),　and　2.0　x　10(5)　Pa.　The　experimental　results　indicate　that　the　heat　transfer　performance　was　strongly　dependent　on　the　thickness　of　the　sintered　mesh　structure　and　on　the　mesh　size.　The　operating　pressure　also　has　a　strong　influence　on　the　evaporation/boiling　heat　transfer　performance　of　a　mesh　structure　sintered　using　a　single　mesh　size.　However,　it　was　also　observed　that　the　evaporation/boiling　heat　coefficient　increased　with　an　increase　in　the　thickness　of　the　capillary　wick　structure,　which　is　less　than　1.0　mm.　The　experimental　results　further　illustrate　that　the　composite　sintered　mesh　structure　was　capable　of　properly　enhancing　the　heat　transfer　performance,　especially　under　high　pressure.　The　maximum　enhancement　was　31.98%.