Based on the results of radon measurement and magnetotelluric in the northern Jizhong depression, this study identifies Quaternary tectonic units, the Daxing uplift, the Dachang Sag, the Langgu Sag, Wuqing Sag and Yangcun slope, and fivelevel tectonic buried hill zones, Fengheying buried hill and Hexiwu buried hill. It is found that the faults controlling the internal concaveconvex structure of the depression are the Daxing fault, the Tongbai fault, the Hexiwu fault and the Baodi fault. Those controlling the internal buried hill of the sags are the FengheyingXiji fault and the Yangshuiwu fault. Based on the depth of carbonate thermal reservoir and the heat source formation mechanism in the Jizhong depression, we determine the principle of finding convex in depression and finding buried hill in concave. At the same time, it should meet four aspects, including source, channel, reservoir and cover. In combination with the comprehensive results of the magnetotelluric sounding and soil radon measurement, the Fengheying buried hill is the favorable target for hydrocarbon drilling, as was also verified by the boreholes. In addition, it is found that the magnetotelluric sounding and soil radon measurement show the same results in locating deep and large faults, thus verifying the results. Magnetotelluric sounding method is accurate in interpreting high resistivity of carbonate reservoir, and the two- dimensional inversion method based on one- dimensional inversion as the initial model is more suitable for the interpretation of concave- convex tectonic pattern in the Jizhong depression.