Damage　modes　of　concrete-filled　double-tube　(CFDT)　columns　under　lateral　impact　were　studied　by　drop　impact　tests　and　numerical　simulations.　Using　the　moment-rotation　relationship　as　the　assessment　indicator,　the　velocity-mass　and　mass-energy　damage　evaluation　models　for　CFDT　columns　were　established.　The　influences　of　the　parameters　including　the　impact　position,　external　steel　tube　strength,　diameter-thickness　ratio　of　internal　steel　tube　and　axial　compression　ratio　on　the　damage　evaluation　models　were　discussed.　The　results　show　that　under　constant　impact　energy,　the　damage　degree　of　the　CFDT　columns　increases　remarkably　as　the　ratio　of　impact　mass　to　impact　velocity　increases.　The　critical　impact　energies　at　different　damage　degrees　are　significantly　different.　As　the　impact　mass　remains　constant,　the　critical　impact　energy　increases　with　the　increase　of　the　internal　steel　tube　diameter-thickness　ratio,　external　steel　tube　strength　and　distance　from　free-end　to　impact　point,　while　it　increases　first　and　then　reduces　with　increasing　of　the　axial　compression　ratio.　The　influences　of　these　parameters　on　critical　impact　mass　decrease　with　the　increase　of　impact　velocity.　Among　them,　the　external　steel　tube　strength　has　the　greatest　influence　on　the　damage　evaluation　model,　the　axial　compression　ratio　and　the　impact　position　take　the　second　place,　and　the　influence　of　the　internal　steel　tube　diameter-thickness　ratio　is　the　least.　©　2025　Chinese　Vibration　Engineering　Society.　All　rights　reserved.