Underground　structures　provide　more　effective　protection　against　air　blast　and　surface　explosions　compared　with　their　aboveground　counterparts,　but　their　safety　is　threatened　by　subsurface　detonations　due　to　the　strong　coupling　between　the　explosion　energy　and　the　surrounding　soil.　For　a　certain　standoff　distance　between　the　explosion　center　and　buried　structure,　the　inside　equipment　may　be　damaged　by　the　strong　vibration　within　the　structure,　while　the　structure　itself　experiences　minor　or　even　no　damage.　This　strong　vibration,　not　damaging　the　main　structure,　but　damaging　the　contained　equipment,　is　termed　in-structure　shock.　In　the　present　study,　a　theoretical　model　is　established　to　evaluate　the　in-structure　shock　environment　of　a　buried　arch-wall　structure　subjected　to　overhead　subsurface　detonation.　Dynamic　soil-structure　interaction,　as　well　as　different　response　modes　including　local　deflection　and　global　rigid　body　motion,　are　incorporated　to　determine　the　response　of　the　concerned　structural　member.　A　small-scale　field　test　was　conducted　to　validate　the　proposed　model.　Subsequently,　shock　response　spectra　are　employed　to　characterize　the　in-structure　shock　level　within　the　structure.　Furthermore,　a　parametric　study　is　conducted　to　examine　the　influence　of　governing　parameters　on　the　structural　response　and　consequent　in-structure　shock　level,　including　soil　parameters,　ground　shock　characteristics,　scaled　distance,　and　location.　The　present　study　not　only　provides　a　method　for　quick　assessment　of　the　in-structure　shock　level　of　underground　arch-wall　structures　subjected　to　overhead　ground　shock　in　preliminary　design　but　also　extends　the　theoretical　prediction　of　buried　structure　response　from　the　directly　loaded　members　to　opposite　ones.