College of Geo- Exploration Science and Technology，Jilin University，Changchun 130026，China

It is important to know the shape and distribution of sandstone bodies in the subsurface when forma- tion and migration of a dune model are determined． The information plays a significant role in identification of the continental oil and gas accumulation． In this study，the combination of ground penetrating radar (GPＲ) and electrical resistivity tomography method (EＲT) is used in mapping the distribution of sandstone bodies in Yanchang Formation． Six GPＲ profiles and seven EＲT profiles are used to analysis． GPＲ data show clear re- flections from the top interface of sandstones． EＲT data show a continuous high resistivity anomaly correspon- ding to the sandstone body． Combined the reconstructed 3D images by GPＲ and EＲT， the spatial distribution of sandstone bodies is described．