Abstract: In this paper,a research is done on the phenomenon of double Earthquakes of moderate strong earthquakes in Shandong province and its adjacent areas.The obtained results indicate that:(1)double Earthquakes of M ≥ 4 moderate size earthquakes mainly concentrated in the strait of Bohai sea and Xingtai area and its nearby tectonic zone;(2)double Earthquakes of M ≥ 5 moderately strong earthquakes mainly distributed near the epicentral regions of nowaday and historical strong earthquakes(M ≥ 7) in the strait of Bohai sea,Xingtai area,Linyi area and Hezearea.It is considered that a relationship between double Earthquakes and Upper mantle uplift,fault development,complex tectonic and high stress condition is presented.