Based　on　the　bi-fold　line　hysteresis　model,　the　mechanical　analysis　and　reasonable　simplification　of　a　coated　pipeline　damping　structure　were　done　to　establish　its　appropriate　mechanical　model.　The　mechanical　model　of　a　single-DOF　hysteretic　system　was　linearized　equivalently　using　the　equivalent　linearization　method　to　analyze　the　variation　law　of　metal　rubber＇s　stiffness　and　damping　with　variation　of　excitation　force,　and　conduct　test　verification.　Meanwhile,　the　characteristic　quantity　was　proposed　to　characterize　damping　performance　of　a　coated　pipeline　damping　structure.　Variation　laws　of　a　metal　rubber　coated　pipeline　damping　structure＇s　damping　characteristics　with　variation　of　its　forming　density,　number　of　coated　layers　and　magnitude　of　excitation　were　studied　with　tests　to　provide　theoretical　and　test　bases　for　vibration　reduction　engineering　application　of　pipeline　systems.　©　2019,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.