To　study　the　influence　of　the　debris　accumulation　caused　by　the　continuous　collapse　of　the　postearthquake　building　structure　on　the　avoidance　distance　of　the　road　red　line,　taking　the　typical　masonry　structures　of　three　stories,　five　stories,　and　seven　stories　as　examples,　this　study　simulates　the　process　of　sloughing　collapse　and　the　positive　and　negative　collapse　along　the　Z　axis　of　the　building　structure　under　28　different　seismic　conditions　in　details.　Taking　＂the　flying　stones＂　into　consideration,　this　study　divides　the　influence　distance　of　the　collapsed　building　structure　under　earthquakes　into　(a)　the　safety　distance　during　earthquakes　and　(b)　the　main　influence　distance　of　the　debris　accumulation　after　the　earthquake.　In　this　study,　two　types　of　movement　laws　of　flying　stones　are　analyzed　statistically　first.　Then,　the　statistical　analysis　and　hypothesis　testing　are　carried　out　on　the　main　influence　distance　of　all　the　debris　accumulation　using　the　influence　width　coefficient,　and　the　main　influence　distance　distribution　probability　models　of　the　debris　accumulation　of　the　collapsed　building　structure　under　earthquake　excitation　are　established.　The　distribution　models　include　the　gamma　distribution　and　the　extreme　value　type　III　along　the　Z　axis　and　the　normal　distribution　probability　model　along　the　X　axis.　Finally,　a　simplified　calculation　table　of　the　influence　distance　of　collapsed　building　structures　is　established.　It　provides　a　scientific　basis　for　the　safe　control　distance　of　buildings　to　avoid　the　road　red　line　and　for　the　minimum　distance　between　the　buildings　and　people　after　a　destructive　earthquake.