At　present,　the　informatization　level　in　the　construction　process　of　steel　structures　is　relatively　low.　Meanwhile,　digital　twin　technology,　with　better　interactive　features,　provides　a　new　development　direction　for　the　intelligent　construction　of　steel　structures.　Therefore,　this　paper　introduces　the　concept　of　a　digital　twin　into　the　steel　structure　construction　process,　analyzes　the　connotation　and　characteristics　of　the　digital　twin　model,　and　proposes　the　digital　twin　model　architecture　for　steel　structure　construction　processes.　Furthermore,　a　method　for　establishing　a　digital　twin　model　for　steel　structure　construction　processes　is　presented,　which　includes　three　stages:　the　acquisition　and　transmission　of　physical　space　data,　the　construction　of　a　digital　twin　virtual　model,　and　information　exchange　in　the　digital　twin　model.　Based　on　these　concepts,　this　paper　describes　a　digital　twin　system　architecture　for　the　steel　structure　construction　process　from　the　perspective　of　data　flow　in　the　digital　twin　model.　Finally,　with　the　application　of　information　technology　in　the　steel　structure　construction　process　of　the　university　park　library　project　in　Xiongan　New　Area　and　the　reconstruction　and　expansion　project　of　the　Nanchong　Gaoping　airport,　the　digital　twin　model　and　its　establishment　method　methods　are　analyzed　practically　and　demonstrated　effectively　in　this　study.