The Department of Deep-sea Geophysics and Resources utilizes marine survey methods and data such as ship-borne/submersible-based multi-beam and shallow bottom profile, optics, DAS, electromagnetic waves, gravity, 2D/3D artificial seismic data, drilling and logging data, and cone penetration test data to conduct research on: (1) tectonic activity, (2) climatic perturbations, (3) marine resources, (4) marine geo-hazards, (5) geomorphic processes, and (6) target localization. The goal of our research is to reveal (1) geometry, kinematics, and dynamics of structures, (2) deep-sea sedimentation processes, (3) seabed instability mechanisms and marine geo-hazards laws. The results will support the frontier fields of deep-sea resource exploration and development, hadal zone and polar margins scientific exploration, deep-sea archaeology, offshore wind farms, marine cables, emergency search and rescue, digital core modeling, CO₂ geological storage potential, evaluation, and monitoring, etc. A new model was proposed that the northern South China Sea margin is a new ‘intermediate’ type of margin. The extended continental crust of the South China Sea with rough top was revealed to be subducting beneath the northern Manila subduction zone. We have developed technology to identify deep-sea shallow strata features and geo-hazards assessment in the South China Sea, which has been applied to the selection of multiple deepwater drilling well sites and won the special prize of the Hainan Provincial Science and Technology Progress Award.