Among　the　state-of-the-art　thermoelectric　materials,　copper　sulfides　(Cu2S)　have　been　predicted　as　promising　thermoelectric　materials　due　to　their　low　intrinsic　thermal　conductivity.　However,　they　still　confront　the　problems　with　lower　electrical　properties,　which　distinctly　restrict　their　thermoelectric　application.　Significant　enhancement　of　thermoelectric　properties　is　a　great　challenge　owing　to　the　common　interdependence　of　electrical　and　thermal　conductivity.　Herein,　a　micro/nano　Cu2-xS　composite,　with　significantly　enhanced　thermoelectric　properties,　is　prepared　via　a　simple　hydrothermal　method.　Due　to　the　synergistic　effect　of　the　introduced　nanostructure　and　the　increased　Cu1.96S　contents,　the　micro/nano　Cu2-xS　bulk　samples　present　a　power　factor　of　10.1　mu　W　cm-1　K-2　at　773　K.　Meanwhile,　a　decrease　of　the　thermal　conductivity　to　0.69　W　m-1　K-1　is　obtained,　originating　from　the　strong　phonon　scattering　of　micro/nano　structure.　Remarkably,　a　ZTmax　value　of　1.1　at　773　K　is　obtained,　which　is　higher　than　the　reported　Cu2-xS　thermoelectric　material　using　chemical　methods.　This　study　proposes　a　facile　microstructure　engineering　strategy　for　the　development　of　high-performance　thermoelectric　materials.