## 6 Result and Discussion
### Discussion  
This paper identifies and analyses the uncertainty in the application of new-generation digital technology in China's construction industry using an improved LDA-DEMATEL-ISM integrated model. The uncertainty indicator system obtained from the LDA identification includes five dimensions: policy, industry, people, economy and law. In the DEMATEL calculation results, perfection of the policy protection system (A\({}_{1}\)) is the causal factor with the highest causal relationship. In the ISM calculation results, perfection of the policy protection system (A\({}_{1}\)) is a deep factor and is the root factor of other factors. According to the calculation results of the DEMATEL method, as the first index of acceptance of digital technology (C\({}_{2}\)) is the most closely related index with other indicators, combined with the calculation results of ISM, the sum of the number of inflow and outflow nodes is the largest, which indicates that the results shown by the two methods are consistent. From the perspective of causal factors and result factors, the causal factors are mostly at the bottom of the multi-level hierarchical structure model, which affects the application of digital technology by affecting other indicators. To sum up, it means that the framework of DEMATEL and ISM integration is reliable and credible. Combining the results of DEMATEL and ISM, this paper argues that perfection of the policy protection system (A\({}_{1}\)) is a key uncertainty indicator for the adoption of digital technologies in the construction industry. Perfection of the policy protection system (A\({}_{1}\)), as the deepest uncertainty indicator in the integration framework, is an important influence on the deep integration of new-generation digital technologies in China's construction industry. [PERSON] (2018) pointed out that economic policy uncertainty will significantly deter enterprises from applying and deploying digital technology and that government stability and continuity in economic policy as far as possible will help the application and promotion of digital technology. The introduction of policies serves as a wind vane for the application of new technologies ([PERSON] and [PERSON], 2018), indicating the direction of the integration of new-generation digital technologies with the construction industry ([PERSON] and [PERSON], 2018). For example, one province issued the \"2021 Construction Science and Technology and External Cooperation Work Points\", pointing out that it is necessary to strengthen the integration and innovation of intelligent construction technology and to develop more than 100 pilot projects for the digital construction of engineering projects throughout the year. The perfection of the policy regulatory system, which ranks second as a causal factor, is an important guarantee for the deep integration of new technologies and the construction industry. As deeper factors, the improvement of the policy guarantee system and the improvement of the policy regulatory system lay the foundation for the smooth implementation of policies and point out the direction for the formulation of technical standards and guidelines, as well as laws for the protection of intellectual property rights. The third factor in the ranking of causal factors is perfection of the legal system of intellectual property protection, which is at the middle level of the multi-level hierarchical structural model. On the one hand, perfection of the legal system of intellectual property protection is the foundation for technological innovation and, on the other hand, it provides a legal guarantee for the willingness of individuals and firms to share new technologies. [PERSON]'s [PERSON] (2018) research found that protecting intellectual property makes it easier for companies to upgrade and iterate on digital transformation. The fourth factor, the improvement of technical standards and guidelines, is also in the middle level of the multi-level hierarchical model.