In order to derive the regional dual-nuclei structure by the method of building mathematical model, this paper redefines regional accessibility and establishes the formula to calculate it.

依据重新定义的区域可达性，本文在均质平原背景的假设条件下推导出了区域双核结构模式的形成机制及相应的参数条件。

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From the latter, it derives the special phenomena of dual-nuclei spatial structure that is made up of the new capital and the old.

对于后者，还衍生出由新旧首都构成的一种特殊的双核结构现象。

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