Abstract: The geologically dangerous sections formed by geologic agent can be distinguished into three kinds, such as neotectonically dangerous section, subsidence - dangerous section, and reactivation-dangerous section. Percolation sections of embankment foundation, earthquake damage sections, and weak stability sections of embankment foundation are of a part of geologically dangerous sections. According to the geological features of the lower Yellow River, three Geologically dangerous sections can be identified, such as Dongbatou, Daliutun-Dongkou, and Lunali-Shilipu sections. Some countermeasures are suggested in this paper.