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An experimental and theoretical study about the penetrating dynamics of a cylinder with its flat face collides against dry quartzite sand is presented amply and convictively in this paper.Noting that the resistance force suffered by the fiat face of a rigid impactor is just the representative of the interface stress, we purpose in this paper to understand the penetrating dynamics based on the analysis for the interface stress, which varies with the evolution of the granular states agitated by impact.