The　earthquakes　caused　the　collapse　of　the　buildings　along　the　street　and　debris　accumulation　causing　traffic　jams　and　seriously　affecting　the　disaster　relief　work.　In　order　to　study　the　collapse　debris　accumulation　of　building　structures　under　the　earthquake　action　and　the　influence　distance　of　debris　accumulation,　a　simulation　model　is　established　based　on　the　explicit　dynamic　analysis　software　ANSYS/LSDYNA.　Three　story　masonry　structure　as　an　example,　simulated　the　continuous　collapse　mode　of　masonry　structure　under　earthquake.　We　divided　impact　distance　of　building　structure　collapse　under　earthquake　into　safety　distance　during　earthquake　and　main　impact　distance　of　debris　accumulation　after　earthquake　and　made　a　statistical　research　in　two　parts　respectively　in　terms　of　the　flying　rocks　phenomenon　in　the　building　collapse　process.　The　results　showed　that　numerical　simulation　method　can　accurately　simulate　the　continuous　seismic　collapse　failure　model　of　the　building　structures　to　provide　a　new　research　idea　to　study　the　seismic　collapse　impact　distance　of　building　structures.