Sea ice plays an important role in the global climate system. The authors combined 3D GPR with drilling during China's second national Arctic research expedition. The interface of ice and sea water can be recognized clearly from the GPR section, consistent with the drilling result. 3D GPR Cube illustrates distinctly the underside morphology and the spatial spreading of inner structure of the Arctic sea ice. After additional calculation, some parameters, such as the upper and bottom surface areas and the volume of sea-ice, can be figured out and then serve as on-the-spot checkout data for the remote sensing and the data simulator. These data also provide the evidence and proof for the study of the formation mechanism and the course of dynamic effect of the sea ice.