Based　on　Penzien　model　and　Hertz-damp　collision　element,　the　authors　construct　a　collision　model　considering　the　PSSI　effect　and　make　a　collision　simulation　and　a　parametric　analysis　for　the　adjacent　buildings.　The　study　results　show　that　the　PSSI　effect　has　a　significant　influence　on　the　collision　between　the　adjacent　buildings　and　the　width　of　the　seismic　joint　the　impact　rigidity　,the　period　ratio　of　the　two　adjacent　buildings　,the　moment　inertia　of　pile　section　and　the　shear　wave　velocity　of　the　soil　also　have　significant　influence　on　the　collision　responses　of　the　adjacent　buildings.