研究了具有多重定态的化学反应中的相变及其临界现象.参照Landau相变理论的基本精神,提出了以判断临界点的稳定性及其热力学函数的连续性为准则,来对临界点进行分类,从而说明了化学多重定态中相变和临界现象的多样性.一般来说,多稳性的级次越高,相变和临界点的式样也越多.最后,对一个在非理想情形下可能具有三稳态的自催化反应模式中的相变和临界现象进行了考察. In this paper, we study the phase transitions and their critical phenomena in a chemical reaction with multiple stationary states.According to the basic spirit of Landau’s theory of phase transition, we propose a method to judge the stability of the critical point and the continuity of its thermodynamic function, Classification, and thus shows the chemical multi-state phase transition and critical phenomena in the diversity.In general, the higher the multi-level stability, the phase transition and the critical point of the pattern more.Finally, In the ideal case, the possible phase transitions and critical phenomena in the autosuppressive reaction mode are investigated.