A study of dynamic factor restricting and influncing the large situation of seismic activity of mainland china

From the point of view of geodynamics and by study of the internal cause restricting and influncing the fluctuation of seismic activity of Mainland China, it is revealed that the active period (300 years), active espisode (about 20 years) and active stage (several years) of the earthquakes of Mainland China is actually a superposition and combining result of sunspot activity, rate change of earth rotation and strong earthquake activity level on a global scale.