Abstract: At about 3:45 am on February 19,2017,a landslide occurred at Luojiapo in Heifangtai Yongjing County,Gansu Province.In order to solve the problem of landslide thickness and volume calculation in the process of landslide disaster,this paper adopts the Sirius PRO UAV,the high resolution DEM data source before and after the landslide is obtained,and then the distribution of the thickness of the landslide accumulation area is calculated accurately combined with the field investigation.The results show that the length of the Luojiapo 2# landslide is 525 m,the total landslide area is about 5.65×10⁴ m²,the total volume of landslide is about 14.7×10⁴ m³,the maximum slide distance is 368 m,and the landslide shear outlet is located in the top surface of the silty clay of Upper Pleistocene Quaternary.The maximum buried depth of deposition zone is 8.35 m,located in the southwest side of the landslide tongue.According to the DOM image and the field investigation,the farmland and canal is the landslide hazard object,and there is no housing damage and casualties.This paper introduces a new research direction for the landslide emergency rescue and rescue by UAV.

Key words: UAV, Heifangtai, landslide, emergency rescue and relief