Abstract: Based on the mesoscopic unit cell of particulate reinforced composites，the monotonic tension and ratcheting behaviors of SiC_p/6061Al composite were simulated by the finite element method. In the simulation，the effects of the coupled boundary condition and the interfacial binding state on the ratcheting of the composite were discussed. Some microscopic deformation features in the matrix and the interface，and their evolution rules were analyzed. The ratcheting of SiC_p/6061Al composite was simulated with a suitable choice of interfacial bonding parameters，and the predicting capability of the finite element model was discussed by comparing the simulations with the experimental results. The results show that considering the coupled boundary condition improves the simulated results greatly；the better the interfacial bonding is，i.e.，the higher Young's modulus，yield strength and hardening modulus are，the smaller the ratcheting strain；the weak interface model with suitable interfacial parameters provides more reasonable simulation to the ratcheting of the composite than the perfect interface model does.