Sitting in the east segment of Central Asian orogenic belt, Xing’an block and Songliao-Xilinhaote block were separated by the Hegenshan-Heihe suture. Likewise, Xingan block and Songliao block were separated by the Nenjiang Fault subsequently. In the central segment of the great Kinghan Range, these two structures overlap and is hardly to be distinguished. To investigate the important structures, divide the structure units, and determine the depth variation of the basement in the east margin of the great Kinghan Range, we have acquired a 60-km-length gravity, magnetic and magnetotelluric coincident profile in Zhalantun-Arongqi area, Inner Mongolia. The 1:20K Buguer gravity data in Zhanlan-Arongqi area were reprocessed. Through multiple geophysical fusion, seven important faults were inferred. Among them, the Pangjiajie Fault, the Hongxing Fault, and Alunhe Fault are deep faults, at least penetrating up to middle crust. In addition, two low-resistivity belts in the middle curst were revealed, among which, C2 anomaly is interpreted as Hegenshan-Heihe suture. geographically. By correlating with 1:25K geological mapping data, the geophysical interpretation results were proofed. The research outcomes are helpful to geological studies of crustal structures at the central-east great Kinghan Range margin. It has the significant implications for regional revolution history of the two blocks.