As　an　auxiliary　braking　device,　the　eddy　current　retarder　(ECR)　has　been　widely　used　in　heavy　vehicles　and　can　effectively　protect　the　friction　braking　system.　In　order　to　solve　the　problem　of　articulated　vehicle　stability,　an　eddy　current　retarder　axle　(ECRA)　is　designed　by　integrating　the　ECR　and　the　axle,　which　directly　brakes　the　trailer.　In　order　to　increase　the　braking　stability　of　the　articulated　vehicle,　the　differential　braking　characteristics　of　the　ECRA　is　studied,　and　the　vehicle　body　status　is　maintained　through　reasonable　differential　braking　control　(DBC).　In　this　paper,　the　differential　braking　performance　curve　of　the　ECRA　is　studied,　the　mathematical　model　of　the　articulated　vehicle　is　established.　The　experimental　data　of　ECRA　combined　with　the　Sinmulik-TruckSim　co-simulation　method,　the　differential　braking　effect　of　the　ECRA　on　the　vehicle　is　analyzed,　the　stability　of　the　vehicle　is　further　studied.