As　light　alloys　have　inherent　friction　and　corrosion　problems,　an　appropriate　ceramic　coating　is　often　needed　to　resolve　these　problems　in　tribological　and　corrosive　environments.　In　this　work,　the　optimized　pore　structure　of　MoS2/Al2O3　self-lubricating　ceramic　coating　was　designed　by　in-situ　synthesis　of　MoS2　combined　with　plasma　electrolytic　oxidation　(PEO)　and　regulating　the　duty　cycle.　The　evolution　of　pore　structure　was　investigated　by　X-ray　computed　tomography.　It　is　found　that　the　power　supply　delivers　more　energy　in　each　cycle　as　the　duty　cycle　increases,　resulting　in　larger　discharge　channels　and　ejecting　more　molten　material.　The　change　of　the　pore　shape　from　connected　to　isolated　and　the　decreasing　of　porosity　through　decreasing　the　duty　cycle,　which　was　caused　by　the　narrowing　of　discharge　channel　and　reduction　of　molten　oxide　ejection　are　acquired.　The　isolated　pores　structure　is　conducive　to　superior　corrosion　resistance,　which　can　blocks　the　penetration　of　corrosive　medium.　Additionally,　MoS2/Al2O3　coating　exhibit　a　75%　reduction　in　coefficient　of　friction　over　traditional　PEO　coatings.　This　coating　preparation　approach　is　expected　to　provide　a　newly　strategy　to　optimize　the　pore　structure　of　the　self-lubricating　ceramic　coating　by　regulating　electrical　parameters.　©　2022　Elsevier　Ltd