The　influence　of　dicarboxylic　acid　and　boric　acid　in　the　thickening　agent　components　on　the　lubrication　performance　of　lubricating　grease　on　the　surface　of　friction　pairs　was　studied.　The　rough　surface　boundary　lubrication　system　models　with　sinusoidal　convex　peaks　and　smooth　wall　reaction　force　field　boundary　lubrication　system　models　were　established　respectively.　The　molecular　dynamics　simulation　method　was　used　to　study　the　load-bearing　capacity,　shear　resistance,　and　friction　performance　of　the　12-hydroxystearic　acid　&　azelaic　acid　grease　system　(A　lubricating　grease),　the　12-hydroxystearic　acid　&　dodecanedioic　acid　grease　system　(B　lubricating　grease),　and　the　12-hydroxystearic　&　acid　azelaic　&　acid　boric　acid　grease　system　(C　lubricating　grease).　At　the　same　time,　lubricating　grease　with　the　same　composition　and　content　as　the　simulated　one　was　prepared　according　to　common　grease　preparation　methods.　Bond　formation　and　frictional　chemical　reaction　film　analysis　were　conducted　on　C　lubricating　grease.　Finally,　combined　with　micro　friction　and　wear　tests　of　lubricating　grease,　the　effects　of　dicarboxylic　acid　chain　length　and　boric　acid　on　the　friction　performance　of　lubricating　grease　were　revealed.　The　results　indicated　that　as　the　pressure　increased,　the　density　of　lubricating　grease　increased　and　the　phenomenon　of　delamination　became　more　and　more　obvious　during　the　pressurization　stage.　C　lubricating　grease　containing　boric　acid　in　the　component　had　a　lower　density　in　all　areas,　exhibiting　the　best　load-bearing　capacity　when　the　pressure　Pz=50　MPa.　During　the　shearing　process,　C　lubricating　grease　always　separated　the　two　rough　peaks,　the　oil　film　did　not　break,　and　the　bearing　capacity　was　the　highest.　The　maximum　stress　values　of　the　B　lubrication　system　containing　long-chain　dicarboxylic　acid　and　the　C　lubrication　system　containing　boric　acid　were　reduced　by　27.1%　and　57.1%,　respectively,　compared　with　lubricating　grease　A.　In　the　meanwhile,　the　friction　coefficient　of　C　lubricating　grease　was　relatively　stable　at　0.090,　which　was　16.7%　and　22.2%　lower　than　that　of　B　lubricating　grease　and　A　lubricating　grease,　respectively,　indicating　that　C　lubricating　grease　had　excellent　mechanical　properties.　Finally,　the　friction　coefficient　value　of　C　lubricating　grease　was　relatively　stable,　fluctuating　within　the　range　of　0.075-0.095.　The　friction　and　wear　results　indicated　that　the　addition　of　boric　acid　to　the　thickening　agent　component　significantly　improved　the　physicochemical　properties　of　lubricating　grease,　with　friction　coefficients　and　mean　values　ranging　from　0.085　to　0.095　and　0.091,　respectively.　The　simulation　results　were　consistent　with　the　experimental　results.　Through　the　above　research,　it　can　be　found　that　compared　with　lubricating　grease　containing　short　chain　dicarboxylic　acid　in　thickeners,　lubricating　grease　containing　long　chain　dicarboxylic　acid　exhibits　better　shear　resistance　and　friction　performance.　The　structure　of　the　thickener　is　strengthened,　and　lubricating　grease　exhibits　better　wear　resistance　and　friction　reduction　performance　when　boric　acid　is　added　to　the　thickener.　This　is　because　under　the　action　of　boric　acid,　the　lithium　soap　and　boric　acid　groups　in　lubricating　grease　not　only　form　coordination　bonds,　but　also　form　a　frictional　chemical　reaction　film　on　the　solid　wall　surface,　significantly　improving　the　physical　and　chemical　properties　of　lubricating　grease.　©　2025　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.