As　a　new　computing　paradigm,　fog　computing　extends　the　ability　of　cloud　computing　to　the　edge　of　the　network　and　is　widely　used　in　the　Internet　of　Things　scenario.　However,　with　the　rapid　development　of　fog　computing,　the　problem　of　data　security　is　becoming　more　and　more　obvious.　It　is　very　important　to　establish　an　efficient　access　control　mechanism　in　fog　computing.　CP-ABE　is　an　effective　encryption　mechanism,　which　is　very　suitable　for　fine-grained　access　control　in　distributed　scenarios.　However,　in　the　process　of　applying　CPABE　to　fog　computing,　there　are　problems　such　as　low　computational　efficiency　and　complex　attribute　management.　According　to　the　characteristics　of　fog　computing　scenarios,　this　paper　makes　theoretical　research　and　algorithm　improvement　on　the　access　control　mechanism　based　on　CP-ABE,　and　proposes　an　outsourced　attribute-based　encryption　scheme　supporting　attribute　semantic　mapping.　The　scheme　is　established　in　the　environment　of　multiple　attribute　authorization　agencies,　and　realizes　outsourcing　encryption　and　outsourcing　decryption,　which　greatly　improves　the　computational　efficiency　of　the　terminal.　In　addition,　semantic　technology　is　used　to　manage　the　attributes　in　the　system,　and　the　user　＇s　attribute　key　is　semantically　enhanced　to　realize　the　semantic　mapping　of　attributes.　Security　and　performance　analysis　show　that　the　scheme　is　secure　under　the　DBDH　assumption　and　has　high　computational　performance.　©　2023　IEEE.