Abstract: <b<Objective:</b< To present a definition of <i<geo-tomography</i<, that is a discipline-branch concerned with the 2D or 3D display and quantitative analysis of the various structure earth-interior by its physical and chemical parameters. This term may be not so familiar in earth-science glossary, it embodies on the following sub-branches:seismic tomography, resistivity tomography, MRS tomography, fracture-plane imaging for seismic focus and image of GPR(ground penetrating radar). Above exploring method can be used to find potential active faults and seismogenic zones which are used to estimate seismic risk, get a reasonable prevention seismic intensity, and ensure safety of high buildings, big bridges, great dam and dikes(for flood disaster reduction).MRS serves in detecting groundwater and drought-resistant. <b<Conclusion:</b< The achievement of geo-tomography presents higher resolution image, serves for the monitoring for magma chamber in volcano regions,and mitigates eruption disaster. The earthquake prediction methods in the future would call for less dependence on past earthquake records and more reliance on improvements about seismogenesis process. The improvement of 3D image display of underground physical parameters (including velocity,density,temperature, elastic & viscosity parameters, absorbing quality factor Q-value etc.)should combine with MRS tomography image, for exploring underground material-transport and its dynamic process, getting higher resolution, that will provide higher quality forecast method, serving in estimating the seismic risk and the possibility of volcano eruption. mitigate the natural disaster.