Abstract: Based on the mesoscopic finite element model of particle reinforced composites，the time-dependent ratcheting behavior of SiC_P/6061Al composites was numerically analyzed at room and high temperatures by employing a three-dimensional (3D) multi-particulate unit cell and advanced cyclic visco-plastic constitutive model .In the simulation，the effects of the particulate arrangement and interfacial binding state on the ratcheting of the composites were discussed. Some microscopic deformation features in the matrix and the interface were also analyzed. The uniaxial time-dependent ratcheting of SiC_P/6061Al composites was simulated by the finite element model with a suitable choice of the interfacial bonding parameters，and the predicting capability of the model was addressed by comparison with the experimental results. The results show that more microscopic details of the composites can be reflected by using the 3D multi-particulate unit cell，and the particulate arrangement influences the ratcheting of the composites significantly；the better the interfacial bonding，the smaller the ratcheting strain；the weak interface model with suitable interfacial parameters provides more reasonable simulation to the time-dependent ratcheting of the composites than the perfect interface model does.