The paper introduces the geological structure background around the Yutian MS 7. 3 earthquake，analyzes the small earthquake activity and image features of regional seismicity in Xinjiang before the MS 7. 3 earthquake，and compares the image features of regional seismicity with the MS7. 3 earthquake in Yutian，in 2008． The results showed: ① 2 ～ 3 years before the Yutian MS7. 3 earthquake，Xinjiang was in the state of strong earthquake bursting，and before the MS7. 3 earthquake，moderate earthquakes with magnitude 3. 0 and 4. 0 in Xinjiang were in the state of calm． ② Before the Yutian MS 7. 3 earthquake，there showed short-term anomalies in regional seismic activity． 3 years before this MS7. 3 earthquake，the earthquakes with MS≥5. 0 in the Altun earthquake zone and source area significantly enhanced，but the earthquakes with MS≥ 4. 0 in the east side of the source area for about 440km appeared up to 5 years of calm． Six months before the MS 7. 3 earthquake，there appeared a seismogenic gap of earthquakes with magnitude 3. 0 and 4. 0 in the source area and dense bands abnormal image of earthquakes with MS3. 0 ～ 4. 0 that almost conjugate distribution． ③ Before the earthquake with MS 7. 3，strong seismicity status and small earthquakes abnormal images in Xinjiang were significantly different with MS7. 3 earthquake in 2008． This may be related with the seismogenic environment of the two MS7. 0 earthquakes．