In this paper, the relationship between the multifragmentation and chaotic dynamics in low energy nuclear reactions and heavy ion collisions at intermediate energy is briefly reviewed. After recalling some concepts about the compound nuclear reaction model and the random matrix theory, we introduce the properties of excited nuclear matter in the spatial-temporal evolution process, such as spinodal instability, phase transition, which are closely related to the nonlinear dynamics. Some important nonlinear dynamical characteristics in these processes are summarized qualitatively. Moreover, the strange structure of the excited nuclear matter at the sub-densities has also been surveyed briefly.
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