Abstract: The overcooling phenomena are very common in inorganic thermal storage materials. This paper mainly studied the overcooling phenomena of dibasic sodium phosphate. Adding an appropriate amount of anti-overcooling agent could reduce its overcooling. The experimental result indicated that，adding aluminum oxide had very good effect to reduce the overcooling of dibasic sodium phosphate，with the phase transformation temperature kept at 35—36℃，and the phase change process could also be maintained for a long time. At the same time，adding some carboxymethylcellulose sodium as thickener not only could improve the stability of thermal storage system，but also could reduce the overcooling.

摘要： 针对磷酸氢二钠的过冷进行研究，加入适量的成核剂降低其过冷度。实验结果表明，添加氧化铝对改善磷酸氢二钠的过冷现象有很好的效果，相变温度保持在35～36 ℃，相变过程也可保持较长时间。同时，添加一定量的羧甲基纤维素钠作为增稠剂，不仅可以改善蓄热体系的稳定性，而且对降低过冷度也有一定的 效果。