This paper deals with the application of deformation simulations and gravity analogy in the study of characteristic formation of graben system in the western part of North China. Experiments disclose that principal stress of the modern tectonic stress field of these graben systems is NEE-SW horizontal compression, and it is accompanied by additional vertically uplifting force from the lower crust and the upper mantle. The experimental results have confirmed that these graben systems are formed mainly due to the occurrences of tensile stress and shear stress on the axis of upheaval region of round edge of the Erdos block.
In this paper, the seismicity here is analysed and studied, and the relation between the formation of graben system and seismicity is simulated using model experiment of laser holography photoelasticity.