Based　on　the　investigation　of　typical　earthquake　disasters，this　paper　reveals　the　phenomenon　of　post-earthquake　urban　structure　alienation　from　the　perspective　of　resilient　cities.　Based　on　the　basic　process　of　urban　restoration，a　key　indicator　named　the　social　impact　factor　of　urban　systems　is　proposed，　which　couples　engineering　science　with　social　science　and　further　revises　the　function　evaluation　for　the　urban　system　resilience.　Finally，based　on　the　Agent　model，this　paper　quantitatively　studies　the　population　redistribution　for　determining　the　social　impact　factor　of　urban　systems，and　quantitatively　studies　the　influence　of　disaster　prevention　education，　earthquake　intensity，　and　post-earthquake　crowd　information　communication　efficiency　on　the　short-term　population　redistribution.　©　2022　Science　Press.　All　rights　reserved.