Various cyclic plasticity models have been proposed in the past. Among them only the subloading surface model fulfills the continuity condition, the smoothness condition and the work rate stiffness relaxation, obeying the associated flow rule, and describes the Masing effect pertinently so that it would be applicable to the prediction of the cyclic loading behavior of materials. The constitutive equation of soils is formulated by introducing the subloading surface model and formulating the rotational hardening rule for the description of the induced anisotropy. Its applicability is verified by predicting monotonic and cyclic loading behavior of sands under drained and undrained conditions and comparing them with test data.