In this paper,we used the Match and Locate(M&L)method to detect the mico-earthquakes through scanning the 24 hours continuous waveform of the Qiaojia M_S5.0 earthquake in Yunnan on May 18,2020 recorded by seismic stations close to focal source,in which 327 missing micro-earthquakes were detected,and the complete magnitude was reduced from M_L1.9 to M_L1.4. Then,we calculated the b-value with the adding catalog of the Qiaojia earthquake sequence,and discussed the seismogenic structure of main shock preliminarily based on the spatial distribution of aftershocks. Our results show that the aftershocks are mainly distributed in the NNW-SSE direction extending about 14km,and the focal depth ranges from 3 to 15km. The depth cross-section shows that the seismogenic fault dips westward deeply. By integrating with the focal mechanism solution of the main shock,the distribution characteristics of aftershocks and the surrounding geological structure setting,we proposed that the seismogenic fault may be a strike-slip fault with NNW-SSE trending,and is closely correlated to the seismogenic structure of the Ludian M_S 6.5 earthquake in 2014.