Abstract: The application of geomorphology to the study of river terraces is one of the most effective ways to search for the invisible active faults in plains. This paper analyzes the cross-section and facies maps drawn on the basis of the data from the survey of the terraces of Yu River, Shill River, Emaokou River, and Dayu River as well as the drilling data, proving the existence of two invisible faults (NE) and an active horst formed under their control.