[Objective] The development and distribution characteristics, formation mechanism and development trend of geological hazards induced by "5·25" heavy rainfall on May 25, 2020 in Gongshan County, Yunnan Province were studied, in order to provide scientific basis for geological hazards prevention and mitigation planning in this area.[Methods] Based on the first-hand data of the post-disaster emergency survey and the systematic collection of regional geological and rainfall data, the hazard process was analyzed and studied.[Results] The concurrence geological hazards in Gongshan County were mainly small landslides and debris flows, which were mainly distributed along the road and on both sides of Nujiang River. Most of the landslides were shallow surface, and debris flows were mainly initiated by landslide. The geological hazards showed typical characteristics of high-location, long-range and chain type disasters. It was very common for landslide or collapse to enter the channel and turn into debris flow.[Conclusion] In the investigation and assessment of geological hazards in Gongshan County, it is necessary to fully consider the investigation of high-location geological hazards, and scientifically evaluate the chain effect caused by geological hazards and the scope of the affected areas; due to the high vegetation coverage in the territory, debris flow will carry a large number of driftwood to rush out, which is easy to form blockage in narrow gully or at the bridge and culvert at the mouth of the gully, which will enlarge the instantaneous volume of debris flow. It is suggested to carry out large-scale geological hazard risk investigation and evaluation in Gongshan County, and organically integrate the evaluation results with the land spatial planning, so as to control the geological hazard risk from the source, and improve the protection standard of debris flow control engineering in the back mountain of the town.