###### Abstract
[20] developed a three-phase mixing model that simultaneously represents three phases in their study of the barrier lake breach flood catastrophe chain. Transport properties of downstream riverbed materials with floods were investigated using a dam breach erosion modeling test. There are now a few multi-stage overall research studies including the catastrophe chain. [PERSON] and [PERSON] [21] established a systemic model for studying mountain landslide barriers and lake flood disaster chains, utilizing it to simulate the disaster process of the Yigong landslide barriers and lake flood disaster chain in Tibet. The Baige Landslide in Changdu, Tibet, is one of China's recent large-scale landslides [22], resulting in direct economic losses exceeding CNY 14 billion and sparking a wide range of social communication impacts. Subsequent monitoring findings indicate that the residual body of the landslide is still experiencing minor-scale movement, raising concerns about the possibility of a large-scale landslide and river obstruction [23]. Consequently, numerous domestic scholars have undertaken numerical simulations and qualitative evaluations of its stability and the likelihood of landslide recurrence [24; 25; 26; 27; 28; 29]. The depiction of network patterns and topological structures in complex real-world systems has increasingly become a mainstream approach for gaining a comprehensive understanding of various phenomena, especially in the context of complex networks. This trend has been driven by the widespread application of network science in real-world scenarios. [PERSON], a Harvard psychology professor, conducted a chain letter experiment in 1967 [30]. Following this, in 1998, American academics [PERSON] and [PERSON] introduced the small-world network model, often referred to as the WS model. [PERSON] and [PERSON] later proposed the NW model for microscopic world scenarios, which simplifies the construction of isolated nodes [31; 32]. Building upon these foundations, [PERSON] and his student [PERSON] introduced the BA model, a scale-free network model of complex networks [33]. These three models are widely used in power systems [34], urban transportation [35; 36], biology [37; 38], traditional industry [39], finance [40], logistics [41], and other fields as classic models of complex networks. Vulnerability, as one of the key characteristics of complex networks, is frequently utilized in conjunction with node importance to evaluate the sensitivity of network disaster risk [42]. This approach aids in identifying critical factorsand weak links within the disaster evolution process, playing a pivotal role in disaster prevention and control strategies. Currently, China has made some progress in the study of landslides in the western regions. However, field studies in this area remain limited due to the challenges posed by harsh environmental conditions, such as extreme cold, high altitude, and traffic and transportation constraints [43]. Furthermore, research on the subsequent chain disaster risk assessment is still underdeveloped. From the literature output, the focus of our country is gradually shifting from dealing with a single disaster to a multi-disaster comprehensive assessment, but there is a lack of complete disaster chain risk assessment studies through examples. There is limited research on landslide hazard chain modeling and risk assessment based on complex network theory at home and abroad. The research objective of this paper is as follows: by analyzing the occurrence process and results of the two disasters of the Baige landslide, the types of secondary disasters caused by landslides are identified, the evolution model of landslide disaster chain network is built accordingly, and the vulnerable links in the network are identified so as to provide reference for prevention and control of similar disaster chains. This paper draws inspiration from supply chain, accident chain, and existing disaster chain risk assessment models.