A rational ground motion selection method plays an important role in structure time history analysis

which depends on whether record′s earthquake character is proper.It is often neglected when selecting real strong ground motion for engineering or study

for the design seismic group and design intensity in Chinese seismic code are too ambiguous to find corresponding records.This paper uses intensity and peak ground motion acceleration（PGA）attenuation relationship to find the proper magnitude window for different design intensity.For structure in farfield and high intensity area

this paper gives a distance range for it.Considering the situation of Chinese and abroad record database

we give the referenced site parameters for different site class.The proposed selection criteria can provide reference for selecting time histories.This method not only narrow the range from large database

but also avoid choosing significantly unreasonable ones.