Abstract: In order to effectively enhance the emergency monitoring and rescue capabilities for sudden natural disasters in earthquake-prone areas, the researchers in this paper took the sudden flash flood and debris flow disaster in Xinhua Village of Malie Township in Hanyuan County of Sichuan Province as an example and used domestic high-resolution satellites and unmanned aerial vehicle remote sensing technology to analyze its terrain and landform characteristics of the disaster basin. The number of buildings affected by the disaster were interpreted, and the number of affected population was estimated. Besides, the disaster situation was predicted, and the emergency detection and rescue analysis were conducted. The results showed that about 3 000 people were affected by the disaster, and 400 disaster preparedness tents and 6.6 t/d of drinking water were prepared. The nearest rescue team to the disaster area was Hanyuan County Fire and Rescue Brigade, located 15.8 km away by a mountain road. There were 13 health and epidemic prevention forces distributed in and around the area, and 5 mining enterprises were affected. Forty-eight houses were destroyed and 25 houses were damaged, with 7 roads cut off due to the disaster. Three rescue areas were designated in the key affected areas, and a total of 18 search and rescue focus areas were delineated, including 4 upstream and 14 downstream areas. Priority has been given to two rescue lifelines leading to the disaster area in Malie Township. And it is recommended to use Xinhua Primary School and Malie Township Central Primary School in Malie Township as temporary relocation sites. The disaster detection and rescue analysis method based on remote sensing technology has great significance for improving the pertinence of on-site personnel search and rescue and emergency preparedness for disasters, and enhancing the efficiency of emergency detection and personnel search and rescue in the flash flood and debris flow of the western Sichuan Province.