In　this　study,　CaF2　was　introduced　into　WC-Co　to　prepare　bulk　self-lubricating　cemented　carbides　by　sinter-HIP.　The　studied　compositions　were　WC-12Co　with　no　more　than　20　vol%　CaF2　additions.　The　effects　of　CaF2　on　the　tribological　behaviors　and　mechanical　properties　of　cemented　carbides　were　investigated.　It　was　found　that　the　prepared　self-lubricating　cemented　carbides　with　CaF2　were　nearly　fully　dense　and　CaF2　would　refine　the　WC　grains.　Although　CaF2　could　not　obviously　enhance　the　mechanical　properties　of　cemented　carbides,　it　improved　their　tribological　behaviors　remarkably.　The　friction　coefficient　and　wear　loss　during　dry　sliding　could　be　reduced　noticeably　by　the　introduction　of　CaF2.　The　mechanism　of　tribological　performance　improvement　was　attributed　to　the　lubricating　film　formation　during　the　friction　process.　It　would　avoid　direct　contact　between　the　friction　counterparts　and　prevent　severe　wear　of　the　materials.　This　study　provides　a　new　promising　approach　for　cemented　carbides　to　achieve　better　tribological　performances　by　the　self-lubrication　design.