An earthquake of magnitude 6.8 occurred in Luding county(29.59°N,102.08°E),Sichuan Province at 12:52 on September 5,2022,of Beijing time. The China Earthquake Early Warning Network produced the first early warning results in 6.1 seconds after the earthquake. The China Earthquake Network Center produced the results of the automatic quick report in 3 minutes after the earthquake. The official quick report results were released in 11 minutes after the earthquake. Then,together with Institute of Geophysics,Institute of Geology and Institute of Earthquake Forecasting of China Earthquake Administration,and National Institute of Natural Hazards,the China Earthquake Network Center produced emergency production in 9 types,including source basic parameters,historical earthquakes,seismic tectonics,seismic moment tensor,aftershock location,and earthquake intensity. Combined with these emergency products,we preliminarily depict the tectonic environment,epicenter characteristics,fault shape and affected area of the earthquake,and analyze the cause of the earthquake in this paper. The results show that the earthquake is a near-upright strike-slip event on the Xuemenkan-Moxi fault in the southeastern section of the Xianshuihe fault zone. The rupture proceeds southeast from the initial rupture point,with the rupture length of about 20km,and the depth of the maximum slip point of about 6km. The results of fine location of aftershocks show that aftershocks are distributed in NW-SE direction,with a length of about 50km and a depth of 3～14km. The distribution direction is basically consistent with the fault strike in the epicenter area,and the dip angle of the fault at the epicenter of the main shock is almost vertical,which is consistent with the evidences revealed by the focal mechanism. Intensity quick report speculation and earthquake intensity map show that the intensity of the meloseismic zone reaches Ⅸ degree,the area is about 280km²,and the total area of Ⅷ degree and above is about 505km²,involving 17 townships. We believe that this earthquake is a rapid release process of the stress accumulated on the Xuemenkan-Moxi fault in the southeastern section of the Xianshuihe fault due to the uplift of the Qinghai-Tibet Plateau and the extrusion of crustal materials on the plateau to the southeast.