Abstract:On the basis of analyzing geological background, earthquakes in the history, and geological structures of Liaokao fault zone, gravity anomaly and aeromagnetic anomaly in western Shandong have been studied and analyzed. Through comparative analysis with the results of the near[CD*2]surface earthquake survey, and the jointing test of Rn and Hg, it is regarded that there is a hidden fault in Liaokao fault with active movement.