Taking Building Information Modeling (BIM) technology as the core, this paper explores innovative approaches for digital conservation of traditional architecture. By constructing a BIM platform with multi-source data fusion, it realizes dynamic integration of building ontology information, environmental impacts, and conservation processes, forming a full-cycle protection system covering data acquisition, risk early-warning, and intelligent restoration. The research focuses on spatial characteristics and material properties of traditional buildings, combining with dynamic monitoring and preventive maintenance technologies. Which could provide scientific methods and technical support for sustainable conservation of cultural heritage.