Abstract: The resurrection of ancient landslide accumulations is one of the main types of geological disasters in the Qinghai-Tibet Plateau in China, and it is also one of the main security threats faced by major traffic and water conservancy projects under construction in western China. Therefore, it is extremely important to study the formation and evolution mechanism of ancient landslide and evaluate the stability of their accumulations, which can provide theoretical support for the early identification and prevention design of the revival of ancient landslide accumulations. In the past ten years, the accumulation of ancient landslide in Jiangdingya, Zhouqu County, Gansu Province, has been partially revived several times, forming landslides to block the Bailongjiang River, posing a serious threat to the safety of local people's lives and property. In this paper, the morphological and structural characteristics of the ancient landslide accumulation of Jiangdingya were identified through on-site investigation and UAV oblique photography, and the evolutionary mechanism and dynamic process of the landslide were analyzed on this basis, and the stability of the accumulation was qualitatively evaluated by combining the inSAR deformation data. According to the results, the ancient landslide of Jiangdingya is a typical large-scale seismic landslide, and the sliding mass slides down in three directions, forming a multi-step accumulation body form today. Under seismic loading, the dynamic process of landslides can be divided into the middle and upper shock-pulling stages, leading edge locking section shearing-landslide starting, trailing edge pulling-sliding body acceleration, leading edge obstruction-sliding body deceleration, and stability stage. Due to the overall decline of the ancient landslide under the seismic load, a large number of rock masses with complete structure exist in the upper accumulation body, so it is relatively stable. Most of the middle and lower accumulations are weak structures composed of fault fracture zones and broken rock masses, which have poor stability and are very likely to be revived in the future.
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