To　establish　a　seismic　risk　assessment　system　of　underground　structure　is　necessary　for　a　large-scale　development　and　utilization　of　underground　space　structure　is　a　new　trend　in　the　development　of　urban　underground　engineering　in　the　future,　whose　risks　of　seismic　damage　can＇t　be　ignored.　Based　on　the　geotechnical　investigation　report　and　calculation　results　of　numerical　simulation　analysis,　a　seismic　risk　fuzzy　comprehensive　evaluation　model　was　proposed　which　suitable　for　underground　structures　by　means　of　risk　control　theory　in　this　paper.　The　evaluation　index　which　including　structures＇　earthquake　response,　engineering　geological　conditions　and　ground　motion　parameters　whose　relationship　with　the　seismic　damage　were　summed　up　was　built　and　AHP　method　was　used　to　determine　the　weight　of　each　evaluation　index.　Furthermore,　the　risk　level　was　described　by　Fuzzy　language.　At　last,　the　validity　of　the　evaluation　model　is　verified　by　a　project　example.　The　research　result　shows　that:　The　risk　assessment　system　can　intuitive　present　possibility　and　degree　of　seismic　damage　of　underground　structure,　and　the　risk　source　can　be　effectively　traced.　Thereby,　a　reasonable　level　of　risk　and　corresponding　risk　control　measures　can　be　gotten　and　carry　out　seismic　risk　management　with　clear　target.　The　establishment　of　earthquake　risk　assessment　system　of　can　provide　some　reference　for　urban　underground　structures.　©　2015　ejge.