Abstract: Through the analysis of the earthquake sequence monitoring, seismic geology, seismicity background and regional seismicity of the epicentral and adjacent regions of the M_S4.9 earthquake in Rong County, the results show that the sequence is of normal swarm type due to a silence to active process before the M_S4.9 earthquake happens, Seismological parameters of the M_S4.9 earthquake epicentral region and the Mt. Huaying fault zone and Mabian seismic zone are normal after the M_S4.9 earthquake. It is believed that the seismogenic faults of the Rong County M_S4.9 earthquake is Rong-Weiyuan base fault.The activity of the M_S5—6 earthquakes on Mt. Huaying fault zone and its adjacent region since 2018 have corresponding connections with the Jiuzhaigou M_S7.0 earthquake in August 2017 on the east Kunlun fault zone of the western Sichuan Province.