Abstract: For shallow exploration in basins, seismic detection technology exhibits advantages of high resolution and strong vertical stratification capability. However, when dealing with deep sag regions, due to the shielding effect of formations like volcanic rocks, which makes seismic signals weaken and imaging quality deteriorated, the interpretation for the development characteristics of deep strata becomes extremely difficult. Magnetotelluric(MT) sounding is unaffected by volcanic formations and is sensitive to low-resistivity information such as mudstones in deep subsurface. Therefore, it complements seismic technology in terms of deep information, enabling acquisition of details about basement framework and undulation of electrical marker beds. Gravity and magnetic anomalies, as passive sources, are mainly influenced by volume effect, without shielding. As long as significant density contrasts or interfaces exist, gravity or magnetic anomalies will be reflected at the surface. These methods provide a powerful mean for the intergraded study of density, lithology, distribution of intrusive bodies, etc. Given the complex geological background of deep Yixian Formation strata in Lujiapu area and its surroundings in southern Songliao Basin, this study leverages the advantages of multiple geophysical methods including gravity, magnetic, electric, and seismic(GMES) techniques to comprehensively explores the distribution characteristics of deep strata, lithology, and structures in the area, which provides references for subsequent oil-gas prospecting of deep reservoirs.