In　the　cloud　server,　ranked　searchable　encryption　allows　the　cloud　server　to　search　for　the　first　k　most　relevant　documents　based　on　the　correlation　scores　between　the　query　keyword　and　the　document.　OPE　(Orderpreserving　encryption)　is　a　widely　used　technique　in　sorted　searchable　encryption　to　protect　privacy.　However,　recent　studies　have　revealed　potential　privacy　vulnerabilities　in　OPE　schemes.　To　address　this　issue,　our　research　paper　proposes　a　novel　approach　called　DP-SSE　(Differential　Privacy-based　Ranked　Searchable　Encryption).　By　incorporating　differential　privacy　into　ranked　searchable　encryption,　our　proposed　approach　offers　a　more　robust　and　secure　solution　to　privacy　preservation,　mitigating　the　potential　privacy　leakage　associated　with　traditional　OPEbased　techniques.　Finally,　the　security　proof,　efficiency　and　accuracy　analysis　show　that　the　scheme　is　feasible.　©　2024　IEEE.