Abstract: Based on the Debye-Hükel activity coefficient theory of electrolyte solution, the activated complex theory of reaction rate and the singular theory of three variables differential equation, a series of theoretic investigation of BZreaction reported in this paper is devoted to explore the influence of the nonideality on chemical oscillatory dynamical regime. Using the Oregonator Model, a systematic dynamics of the nonideal homogeneous BZ reaction system is proposed. The threshold of chemical oscillation is calculated and then the critical diagram "concentration of NaBrO₃-ionic strength" has been drawn. By means of it the regime of oscillation could be fixed quantitatively. Aset of experiments has also been done. The results is in accordance with the theoretical conclusions.

Key words: Nonideality, BZ reaction, Oregonator model