Capillary-driven　evaporation　of　liquids　play　an　important　role　in　the　thermal　management　of　electronic　devices.　The　recently　developed　nano-porous　evaporator　supported　by　microchannels　proved　to　be　promising　in　heat　dissipation　and　energy　saving.　In　this　work,　we　proposed　novel　modifications　to　the　nano-porous　evaporator　structure　which　could　simultaneously　enhance　the　dry-out　heat　flux　and　heat　transfer　coefficient.　These　include　a　non-uniformly　distributed　nanopore　size　and　a　membrane　with　shortened　length.　By　conserving　the　farthest　nanopore　size　and　enlarging　the　closer　nanopores,　or　simply　removing　part　of　the　membrane,　the　pressure　drop　and　thermal　resistance　of　the　evaporator　were　both　minimized.　Numerical　approach　was　developed　for　simulating　the　heat　transfer　and　fluid　flow　in　the　nano-porous　evaporator.　Kinetic　boundary　conditions　were　applied　at　the　liquid-vapor　interface　to　simulate　evaporation.　Results　of　temperature　and　pressure　fields　were　obtained.　It　was　found　that　the　evaporative　thermal　resistance　and　the　pressure　drop　in　microchannel　played　dominant　roles　in　determining　the　evaporator　performance.　The　structure　with　partial　membrane　10　mu　m　in　length　had　the　best　heat　dissipation　performance,　which　improved　the　dry-out　heat　flux　and　heat　transfer　coefficient　by　22.3%　and　139.5%,　respectively,　compared　to　the　benchmark　evaporator　structure.