With the development of the digital age, the protection and transmission of rural intangible cultural heritage have encountered new challenges which cannot be solved by traditional means. To this end, this paper puts forward a digital narrative expression mechanism based on digital twin technology and builds a specific ecosystem model of rural intangible cultural heritage. The collection of primary information depends on the application of web scraping technology. Based on this, BIM technology and CIM technology can be used to create digital twins of physical spaces, thus ensuring spatial continuity of the rural intangible cultural heritage. As physical limitations, street width and building function obtained by BIM/CIM can regulate the behavior of the agent, and cultural inheritance rules stored in the knowledge graph of intangible cultural heritage will impose constraints on the decision-making process of the agent. The combination of the two produces a consistent space-behavior simulation. Through empirical research, fuzzy comprehensive evaluation of the digital narrative expression mechanism suggested above yields results as follows: Excellent (0.3969), Good (0.2081), Moderate (0.2067), Poor (0.1395), and Very Poor (0.0488). According to the maximum membership principle, the evaluation result of this mechanism is Excellent.
