RuanijaPeng river bed sees three land forms: rock door，water faIl and pond．At the section of the rock door，outdoor and indoor there is sandstone cover of the Lushan metamorphic core complex; while at the  middle waterfall section the microscopic breccia zone of the major detachment fault outcrops; and below the pond there is the exposure  part of micaceous quartz mylonite among the major detachment fault zone.