Abstract: The overconsolidated clay model, a simple and applied model, can describe many characteristics of overconsolidated clays well, including stress-strain relationships, stress dilatancy, strain hardening and softening, and path dependency behaviour. Compared with the Cam-clay model, the overconsolidated model only requires one additional soil parameter which is the slope of the Hvorslev envelope. Based on the specialy mobilezed plane(SMP) criterion and the corresponding transformed stress tensors, the model can be applied conveniently to three-dimensional complex stress state. By using the loading criteria, the model can be used to describe that the hardening degree, the shear modulus and the overconsolidated degree increase, and the void ratio decreases with increasing cyclic times under the complex loading. The comparisons between predicted results and test data from the cyclic loading and true triaxial tests show that the model can rationally exhibit the soil behaviors under the complex loading.