Abstract: Based on the explanatory results of two magnetotelluric sounding profiles which connect the folded belts of Southwest Tarim Basin with West Kunlun. the geoelectric tectonic characteristics of lithosphere along the measuring areas are studied and analysed. It is pointed out that the width of nappe is about 40km and the nappe distance from south to north is more than 20km within the larger-scale developed overthrust nappe tectonic belt on the southwest edge of Tarim Basin. Moreover, tectonic units are divided and the tectonic contact relations of each unit are approached according to electrical data. Lastly, by means of comprehensive analyses on the characteristics of isostatic gravity anomaly, seismic activity etc. of this area, the intracontinental subducting patterns between Southwest Tarim Basin and West Kunlun are studied and established, and the viewpoint and cognition that the nappe tectonics extensively present in the area relate to intracontinental sub-duction existing in deep earth crust are suggested.