In　order　to　accurately　and　quickly　identify　the　anti-explosion　safety　risk　of　the　group　buildings　outside　the　plant　boundary　of　the　major　hazards,　firstly,　based　on　the　urban　disaster　risk　system　theory　and　disaster　risk　management　concept,　an　anti-explosion　safety　risk　assessment　index　system　of　group　buildings　was　established.　The　four　assessment　dimensions　include　explosive　hazard,　explosive　vulnerability,　anti-explosion　safety　capacity　and　anti-explosion　response　capacity.　Secondly,　an　anti-explosion　safety　risk　assessment　model　based　on　the　extension　connection　cloud　is　constructed.　It　eliminates　the　uncertainty　generated　by　the　cross-fertilization　of　multiple　risk　information　and　realizes　the　quantitative　assessment　of　the　anti-explosion　safety　risk　level　of　group　buildings.　Finally,　in　order　to　verify　the　effectiveness　of　the　assessment　methodology,　the　assessment　process　is　applied　to　group　buildings　outside　the　major　hazards　of　explosives-type　hazardous　chemicals　in　a　city.　The　results　show　that　the　method　can　quickly　and　effectively　assess　the　level　of　anti-explosion　safety　risk　of　group　buildings.　The　method　reliably　and　intuitively　reflects　the　anti-explosion　deficiencies　of　group　buildings.　It　provides　decision-making　support　for　the　anti-explosion　safety　planning　and　construction　of　group　buildings　outside　major　hazards　enterprises.　©　2024　Institute　of　Engineering　Mechanics　(IEM).　All　rights　reserved.