Abstract: Ground Penetrating Radar is a high and new modern technology to survey and detect.Based on the regulars of high frequency electric and magnetic wave traveling underground media,this technology is widely used in disaster geology survey,undamaged detection of road engineering quality,as well as in engineering geology survey of shallow and extra shallow media.In this article,the method and principle are briefly introduced and the relationship between road structure mode and Ground Penetrating Radar reflecting signal is discussed basing on the application of Ground Penetrating Radar in surveying quality of road engineering.The author also gives the examles to demonstrate the effect of this method.