本文通过热分析测定,X射线物相分析、分级结晶分离、固化分离及固化分离理论收率公式与经验收率公式的一致性等多角度验证,证明邻、对位氯甲苯固液平衡体系是一个具有最低凝固点(-50.75℃;26.88％对位)的完全互溶型固溶体。结果表明,目前国际公认的简单低共熔型相图的结论与实验事实不符。并且还给出了邻氯甲苯和对氯甲苯的粉末衍射卡。 In this paper, by the multi-angle verification of thermal analysis, X-ray phase analysis, fractional crystallization separation, solidification separation and the consistency of theoretical and empirical yield formula, it is proved that the solid-liquid equilibrium system of o- and p- A completely miscible solid solution with the lowest freezing point (-50.75 ° C; 26.88% para). The results show that the current internationally accepted conclusion of the simple eutectic phase diagram is inconsistent with the experimental fact. Also given were o-chlorotoluene and p-chlorotoluene powder diffraction card.