Abstract: Pingyao ancient city wall is a valuable cultural heritage of our country. Because of the old age of the city wall as well as the modern times artificial destroying, its inner structure has changed greatly, there are some horse faces and wall body appear rifts, even happen collapse at present. This paper uses the ground penetrating radar application technology as the foundation, examines the ground penetrating radar in Shanxi Pingyao ancient city wall restoration application and its basic principles briefly. The paper further discusses the goal body examination by the ground penetrating radar, the accurate surveying results of theancient city wall interior soft soil body, holes, cracks, and so on, gives the dangerous ranking, and provides the reliable basis for the scenic spot historical site restoration.