Research conclusions: ( 1) The data obtained by CSAMT method: The subsurface section is divided into five regions: fault，anomaly gradation Ⅴ，anomaly gradation IV，anomaly gradation Ⅲ and gradationⅡ． The existence of Huangcaoba Fault is confirmed by the data obtained by CSAMT method and it provides the basis for the validity of the Gaoligongshan Tunnel project． ( 2) The data obtained by MT method: The MT method is the first time to use for the geothermic survey for railway tunne． For improving the transverse resolving of the MT data，a prospecting point is installed separately every 200 m while the prospecting point is generally installed every 1 000 － 10 000 m for surveying the regional structure for oil field survey． In order to enhance restriction faculty of the inversion model and the reliability of inversion result，1D OCCAM inversion plus 2D NLCG inversion are made through synthetizing the data of the TE mode and TM mode． There are six bigger and deeper faults( F7 － 1 ～ F7 － 6) in the site of the Gaoligongshan Tunnel and they may be the channel of the geothermic water． In addition，there is one suture zone in deep area at DK 214 + 400 and it is approximately upright and is extended downwards at least by 30 km．