The relation between earthquake and tectonics in the eastern part of North China was examined.The starting point of examination is to analyze the tectonic appearances in occurrence processes of the strong earthquakes. By the data of focal mechanisms, surface deformations, aftershocks, isoseismals and geodetic measurements for 5 strong earthquakes occurred in 1966-1976, it was found that the earthquake fractures appear as conjugate shear fractures with asymmetric amount.There is a predominant newbornness in the relation of earthquake fracture to tectonics.