The paper studies the seismogenic structure by the regional seismotectonics and focal mechanism and compares the strong earthquake sequence of time and space distribution characteristics of the Da Qaidam with the sequence distribution characteristics of the Delingha M6.6 earthquake in 2003, and the other 5 strong earthquakes of 2004 in Delingha. The regional characteristics of the historical seismic activity had been analyzed. This preliminary study shows the regional influence of the two earthquakes with M8.0 for last 10 years. The paper also discusses precursory anomaly and some of its characteristics on the basis of the region precursor observation data of the Qinghai Province.[著者文摘]