Abstract: The corresponding relationship between the macroscopic and microscopic mechanical parameters is investigated through numerical simulation method. Based on the results of large number of three-dimensional particle flow code numerical tests, a quick calibration method for calibrating the microscopic mechanical parameters of Rock-like material in PFC3D is proposed, and the reference value of microscopic mechanical parameters are determined by the fitting relationship between the macroscopic and microscopic mechanical parameters. A cylinder numerical model for rock-like material is established according to the proposed micro-parameters. The common triaxial tests for the cylinder model are simulated. The simulated results have a good consistency with the laboratory model triaxial tests, and reliability of the proposed method for microscopic mechanical parameters is validated.