Since 1955,it has been a normal period of Seismic activities without the earthquake of M_s≥6.0 in Gansu region.This paper discusses the activity characteristics of variant magnitude class earthquakes during this period.The normal background value in seismic activities and ab-normal director of precursor activities of the large earthquakes with magnitude M_s≥6.0 in future are suggested.Finally,the seismic activi-ty trend of the coming years in Gansu region is analysed