Numerous large-scale acanthomorpic acritarchs have been found in Neoproterozoic Ruyang Group on the southern margin of North China old land. They are acritarchs with double layers, complex ornaments on the outer layer, dense hollow or nets on the inner layer and nucleus in the cell. According to a biostratigraphic analysis, the Neoproterozoic strata with large-scale acanthomorpic acritarchs will fill up the gap of the Jixian section. This paper deals with the appearance of the acritarchs, stratigraphic correlation, and the possible tectonic implication of the acritarchs in the light of biostratigraphy, geochemistry and lithology.