Abstract: Discusses the conduction mechanism of prism-shaped graphite concrete in view of the whole process of an axial loading test, as well as the method of analogy and damage to the concrete. Analyzes the reasons why the up-and-down trend as shown on the deformation modulus-strain relation curve conforms to that as shown on the conductivity-strain curve. In case a specimen is damaged, its electric field and force field both comply with Laplace equation, and their boundary conditions are also in accord with each other. It means that it is possible to draw an analogy between the two fields in the whole loading test process of the graphite concrete samples, i.e., the correctness of such an analogy is verified by the test. Like the deformation modulus, the electrical conductivity is such an eigenvalue of a material that will characterize well the damage and rupture process.