The　improvement　of　the　transmission　capacity　of　the　line　of　EHV　submarine　cable　has　become　urgent　issues　that　need　to　be　addressed.　The　transmission　capacity　of　the　EHV　submarine　cable　is　mainly　determined　by　the　operating　temperature　of　the　submarine　cable.　Therefore,　several　cooling　schemes　are　compared　to　analyze　their　cooling　effect　on　the　cable　core　temperature　in　this　paper.　For　the　water　pipe　cooling　scheme,　the　cooling　effect　is　the　most　significant　when　the　velocity　of　the　cooling　water　is　slower　than　0.1 m/s,　increasing　the　number　of　cooling　water　pipes　can　effectively　reduce　the　cable　core　temperature.　For　the　wind　cooling　scheme,　the　cooling　effect　is　the　most　significant　when　the　velocity　of　the　air　is　slower　than　0.1 m/s,　and　the　cooling　effect　is　more　significant　with　the　air　velocity.　For　the　backfill　soil　cooling　scheme,　the　cooling　effect　is　more　significant　with　the　thermal　conductivity　of　the　backfill　soil.　©　Beijing　Paike　Culture　Commu.　Co.,　Ltd　2024.