Abstract: The concept of slide life cycle was suggested based on the fact that there was the whole process of birth, grow and death for slide. Its dynamic rule was analyzed during its single life cycle and the periodical change was described by the stability coefficient, then its characteristics of dynamic, phasical and progressive with time change was discussed. The stability coefficient was divided into tendency, periodic and random and was analyzed by fitting, the homomorphic model was founded, which was provided as the reference for slide forecast.

Key words: slide, life cycle, dynamic rule