We　demonstrate　the　fabrication　of　in-plane　and　multi-layer　3D　micro-supercapacitors　(MSCs)　based　on　laser　carbonization　of　polyimide　(PI)　sheets.　Focused　femtosecond　(fs)　laser　pulses　rapidly　convert　the　insulating　PI　into　an　electrically　conductive　porous　carbon　structure.　The　specific　capacitance　of　the　single-layer　supercapacitor　with　a　thickness　of　80　mm　reaches　22.40　mF/cm(2)　(2.8　F/cm(3))　at　0.1　mA/cm(2)　charge-discharge　current　density.　The　high　performance　is　attributed　to　hierarchical　porous　structures　and　the　appropriate　heteroatom　nitrogen/oxygen　doping.　The　2-layer　and　3-layer　stacked　MSCs　show　an　improved　specific　capacitance　as　high　as　37.2　mF/cm(2)　and　42.6　mF/cm(2)　at　a　current　density　of　0.1　mA/　cm(2),　respectively,　which　are　attractive　values　among　the　carbon　material-based　MSCs　reported　till　now.　The　voltage　and　capacitance　can　be　scaled　up　by　simply　writing　MSC　arrays　in　serial　and　parallel　connections.　The　facile　fabrication　and　superior　performance　of　carbon-based　MSCs　fabricated　by　laser　direct　writing　may　pave　the　way　for　promising　applications　of　flexible,　portable,　and　wearable　electronic　devices.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.