Abstract: Static and dynamic parameters of silo-grain interface greatly influence granary structure design and its optimization analysis. Therefore, these parameters are required to be further clarified. Under the conditions of different void ratios and vertical pressures, the monotonic direct shear tests, reciprocating test and post reciprocating monotonic direct shear tests were carried out using a self-developed grain dynamic loading direct shear apparatus. The results show that, in the monotonic direct shear test, the interface strength increases with the decrease of void ratio and the increase of vertical pressure. The interface volume presents the phenomenon of shear shrinkage, and with the increase of vertical pressure and void ratio, the final shear strain increases gradually. In the reciprocating test, the specimen shows shear hardening phenomenon, with the maximum shear stress increases and then gradually stabilizes during the reciprocating process. The dynamic shear modulus increases with the increase of the number of cycle numbers, ranging from 7.39 kPa/mm to 18.15 kPa/mm. The damping ratio first decreases and then tends to be stable with the range of 0.39-0.47. The peak value of interfacial shear stress in the post- reciprocating direct shear test is larger than that in the monotonic direct shear test, and the corresponding strength parameters are improved accordingly. The research results provide a theoretical basis for the design parameters of the static and dynamic working conditions of concrete granary-grain particle interface.