A lot of seismites were found in the Mesoproterozoic and Neoproterozoic in Pingquan, Hebei. Four main types of seismitic rocks, friability, plastic, liquefacient and multiplex, were recognized. Discriminating marks between tsunamigenic rocks and tempestite were put forward. The Bouma sequence, which may be established in tsunamigenic rocks and tempestite, is not of bathyal turbidite. According to the horizon and frequency of seismites, ten seismitic active periods can be divided. The cycle rhythm of each period was 60-80 Ma, which reflects the regularity of faulting in the northern margin of the Yanshan aulacogen.