在- 50 ～ 50℃范围内，利用差示扫描量热法测量了21 个摩尔比b 的系列氯化钠水溶液，除纯水外，所有浓度的溶液 均出现了双峰，随b 的增加，高温峰强度减小、峰位向低温移动，低温峰则相反，最后逐渐重合. 提出了重叠双峰的分峰方案，并 得到了各熔化峰的特征量随b 的变化结果，该结果与微观相分离模型一致，并据此给出了溶液中氯化钠浓度空间分布情况. 该 研究对深入认知生物体中电解质的微观结构和固液相变等有一定的参考价值.

The heat flows of a series of sodium chloride aqueous solutions contained 21 molar ratios b are measured and analyzed by differential scanning calorimeter in the range of - 50 ～ 50℃. All measured solutions except water appear two endothermic peaks. The peak positions of both move to each other with the increase of b，at the same time，the intensity of high temperature peak decreases and the one of low temperature peak increases. At last，two peaks are gradually overlapped. A method to separate overlapping double peaks is proposed and the b dependent characteristic parameters of melting peak are obtained，which are consistent with the micro - phase separation model. Finally，the spatial distribution of sodium chloride aqueous solutions concentration is given. This research will provide a certain reference to deeply understand the microcosmic structure of the sodium chloride in aqueous solution and solid - liquid phase transition.