在量子分子动力学的基础上,利用原子核发生碎裂时的碎块质量分布、密度涨落以及混沌动力学中描述混沌程度的最大Lyapunov指数,从动力学方面对原子核的液气相变及其在临界点的行为进行了较为全面的探讨。通过研究发现,在临界温度处,原子核发生最大的液气共存,密度涨落达到极大以及产生最大混沌构型。 On the basis of quantum molecular dynamics, the mass and density fluctuations of fragments in the nuclear fragmentation and the maximum Lyapunov exponent describing the degree of chaos in the chaotic dynamics are used to study the liquid-gas phase transition of the nucleus and its influence on The behavior of the critical point for a more comprehensive discussion. Through the study, we found that at the critical temperature, the largest liquid-gas coexistence occurs in the nucleus, the density fluctuation reaches the maximum, and the maximum chaotic configuration occurs.