Seismites of the Shidian Member of the Cambrian Mantou Formation have been found in different areas of the central Shandong Province in recent years. They were formed in a dry tidal flat lagoon environment, and developed in the upper part of the Lower Cambrian. They have the characteristics of intra-layer structures recording strong seismic events, such as the escaped structure of water (seismogenic micrite vein) , liquefied fold deformation, micro-fault-graded and net-like cracks etc. Through a comprehensive correlation of the strata, the isochroneity of seiemites in different areas is proved in the paper. It is considered that there was a seismic active period at the end of the Early Cambrian in the central Shandong area. The seismic sequence belongs to the original position system of the vibrational liquefaction seismic sequence in carbonate rocks put forward by Qiao Xiufu(1994, 2001a), and the distribution of the seismites was in a region of earthquake intensity of 7-11 degree caused by some strong palaeo-earthquakes about 510 Ma ago, with the palaeo-Tancheng-Lujiang fault zone as the seismic center. In order to be distinguished from the seismic event bed of the Neoproterozoic Shiwangzhuang Period in the central Shandong area, this earthquake-genetic stratum is temporarily named the seismic event bed of the Mantou Period.