Chaos theory can offer a new conceptual and methodological framework for the study Personality Disorders. This new approach considers human beings as dynamic systems, mathematically speaking, in constant evolution-reorganization, with periods of stability and instability and in continuous interaction with the environment. The behavior of these systems will be unpredictable but determined by certain laws that can be expressed by nonlinear equations. Likewise, this approach considers personality disorders as phases in the evolution of systems in which they behave in characteristic patterns. This innovative perspective allows the study of the dimensions and processes over time and the understanding and explanation of behavior at different stages. Dynamic system key concepts can be applied to the ways in which personality disorders are considered, evaluated and treated. Fundamental issues related to these three aspects are revised.