Abstract:We use the double difference location method to relocate the 15 816 earthquakes recorded by dense station array in northwest Yunnan from April 2018 to September 2020. 14 110 relocation events are obtained. We obtain the accurate spatial distribution of earthquakes in northwest Yunnan. The results show that: 1) The distribution of earthquakes in the study area is not uniform. Most of the earthquakes are distributed along the boundary of the deep and large faults, which fully shows the pattern of faults; 2) The predominant focal depth of the earthquakes is 7-11 km, indicating that the earthquakes mostly occur in the middle and upper crust; 3) The depth distribution characteristics of the earthquakes in each profile show the structural characteristics of the fault in the deep.