To demonstrate the nonlinear features of the evolutionary process of rockmass slope system,In this paper the self-organizing feature of the rockmass slope system is described firstly;Secondly,we establish a nonlinear dynamics model with the cusp catastrophe model and chaotic dynamics to analyze the evolution process of rockmass slope system.The mechanical criteria is obtained from the analysis,and the analisis also indicates that the rockmass slope system is of nonlinear mutagenicity and the chaos phenomenon really exists in the process of evolution.