Bimodal　nanoporous　structure　shows　great　potential　in　a　wide　variety　of　applications.　So　far,　however,　a　scalable　fabrication　method　for　bimodal　nanoporous　structure　with　controllable　morphology　and　size　remains　a　critical　challenge.　Herein,　we　prepare　a　homogeneously　bimodal　nanoporous　copper　which　consists　of　nanoslit　and　nanopore　through　combined　laser　processing　and　dealloying.　The　nanoslit　and　nanopore　size　can　be　easily　altered　by　simply　controlling　the　laser　processing　parameters.　With　decreased　heat　input　during　laser　processing,　the　width　of　nanoslit　decreases　from　200　nm　to　100　nm　and　the　average　size　of　nanopore　decreases　from　23.7　to　14.0　nm.　The　bimodal　nanoporous　copper　is　found　to　be　principally　influenced　by　metallurgical　reaction　during　laser-material　interaction.　Compared　with　equilibrium-solidified　as-cast　alloy,　phase　separation　and　refined　microstructure　induced　by　non-equilibrium　solidification　through　laser　processing　facilitates　corrosion　rate　during　dealloying　and　induces　bimodal　nanoporous　structure　after　dealloying.　©　2021　The　Society　of　Manufacturing　Engineers