In　view　of　the　problems　of　traditional　paper　document　recording　for　ancient　architecture　protection,　such　as　heavy　workload,　errors,　incomplete　information　recording　and　difficult　information　retrieval,　this　paper　studies　the　application　method　of　digital　archiving　of　ancient　architectures　based　on　multi-information　fusion　technique,　which　combined　with　the　advantages　of　terrestrial　3D　laser　scanning　technology,　3D　modeling　and　virtual　reality,　by　taking　the　example　of　Hualin　Temple　Hall　which　is　a　national　protected　heritage　of　Song　Dynasty　in　Fuzhou　City　of　China,　from　the　collection　and　processing　of　point　cloud　data　to　the　generation　of　CAD　drawings　of　surveying　and　mapping,　to　the　creation　of　3D　models,　and　then　to　the　virtual　reality　design.　Finally,　aiming　at　the　technical　difficulties　of　poor　data　compatibility　and　decentralized　management　in　application,　this　paper　puts　forward　a　specific　coping　strategy　which　is　＇Multi-source　Data　Fusion　and　Unified　Platform　Management＇,　in　order　to　provide　reference　for　the　future　repair,　protection　and　research　of　ancient　architectures.　©　2024　IEEE.