For　quasi-static　pushover　test　of　soil-underground　structure　system,　the　optimization　of　model　box　type　and　the　influence　of　lateral　boundary　displacement　distribution　in　the　test　are　studied　by　the　numerical　method　in　this　paper.　Firstly,　a　quasi-static　pushover　test　scheme　of　soil-underground　structure　system　is　introduced,　and　then　the　free-field　finite　element　model　and　the　soil-structure　finite　element　model　of　the　quasi-static　pushover　test　are　established　and　analyzed.　It　compares　the　distributions　of　the　equivalent　seismic　load,　the　soil-structure　interaction　forces,　the　seismic　capacity　of　the　structure　and　the　equivalent　plastic　strain　nephogram　of　concrete　structures　under　different　lateral　boundary　displacement　distributions.　The　results　show　that　the　distribution　of　the　lateral　boundary　displacement　has　influences　on　the　distribution　of　the　equivalent　seismic　load　and　the　soil-structure　interaction　forces　and　the　structural　inner　forces.　In　particular,　the　lateral　boundary　displacement　distribution　has　a　significant　impact　on　the　test　results　of　the　multi-story　model　structure,　and　may　even　affect　the　failure　process　and　weak　components　of　the　multi-story　model　structure.　Due　to　the　randomness　of　seismic　load　and　the　diversity　of　model　structure,　it　is　reasonable　to　use　laminar　shear　box　with　adjustable　lateral　displacement　distribution　in　the　quasi-static　pushover　test　of　soil-underground　structure　system.　©　2021,　Science　Press.　All　right　reserved.