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Granular matter is one of the most abundant and familiar substances on earth. Despite the widespread existence of granular matter in daily life, researchers and engineers have poor understood of the rules such as the spatial distribution, mechanics response and flow characteristics of particles. For example, when people walk on the beach, how is the force of their feet on the sand transmitted through the sand? In order to explain the peculiar phenomena of particulate matter, it is of great significance to analyze the static mechanical properties of particle systems. To study the internal structure of the granular matter, many experimental and simulation methods have been developed. In this paper, the model of granular solids under external load is obtained by X-ray computed tomography (CT) technique. A simple experimental device is used to analyze the internal force transfer of the particles, and a 3D force chains model is established inside the particles. 3D force chains model is created according to Hertz contact theory. The statistics and spatial distribution of interparticle force are analyzed; the lateral pressure coefficient and friction coefficient are calculated; the distribution law of bottom pressure in granular system is analyzed. The results show that the distribution of the force inside granular solids has a large random characteristic, and the distribution of the force away from the loading position has a certain rule. This experimental method can provide a reference for the study of complex granular system.