It is very important to calibrate the parameters conveniently and accurately in numerical direct shear test of cemented structural plane. Therefore, PFC^2D numerical direct shear test was carried out on rocks with cemented structural plane, and the quantitative relationship between macro and micro parameters is analyzed to study the calibration method of mechanical parameters of cemented structural plane. The results show that the cohesion, internal friction angle, shear stiffness, normal stiffness of the structural plane are determined by the tangential bonding strength and internal friction angle, internal friction angle, shear stiffness and normal stiffness of the mesoscopic parameters; The residual strength is directly proportional to the meso-friction coefficient, Normal bond strength parameters do not affect the calibration of structural plane mechanical parameters. On the basis of determining the quantitative relationship between macro and micro parameters, a parameter calibration method for PFC^2D numerical direct shear test of cemented structural plane is proposed., which greatly simplifies the calibration process of cemented structural planes parameters.