In a bedded chert section at Dachongling in Xiaodong town of Qingzhou, Guangxi, the authors found a rare earth elements (REE) geochemical anomaly zone with higher Ce/Ce* values, a positive Ce anomaly zone (the background is negative Ce anomalous zone) in the shale-normalized REE pattern, and a zone of sharp lithological change at the basal boundary of the Lopingian Series. These zones coincide with the zone of sharp change in radiolarian groups. This fact may indicate that the pre-Lopingian crisis event are reflected very well in this section. It is inferred that the cause of the event was a global regression at the end of the Guadalupian, and the event continued for a long time that is equal to the late Capitanian period.