In order to detect the structure of strata and the distribution of sand body,analysis the effectiveness of audio-frequency magnetotelluric method in basalt covered area,two AMT survey line was set in Yihegaole area,Erlian basin. With the inversed resistivity,the distribution of sandstone bodies,basin base and faults were delineated for the uranium exploration. The drilling result verified that the AMT method is accurate and reliable in reflecting the basement morphology,stratum structure and sand body distribution of the basin,which provide important support for the prediction and evaluation of uranium resource potential in this area.