Based on the concept of disturbing structure, this paper presents a progressive yield constitutive model by extending the CamClay model in order to describe influence of the disturbing structure on soil behavior. The internal variable of yield surface is not just a constant parameter, and it should be treated as a distribution function in a range. The single yield surface of the CamClay model wis extended to a field of yield surface. Then by introducing the progressive yield concept into the CamClay model, the progressive yield constitutive model wis developed. Only one parameter wis added besides the three parameters of the CamClay, which represents the disturbing structure of the soils. The application results show that the model can predict the progressive yield of the soils.