通过热处理、酸处理实验，利用Ｘ－ｒａｙ 衍射、发射光谱分析、ＸＴＬ－ Ⅱ显微观察对合成金刚石进行了较系统的研究。结果表明：粉末触媒合成金刚石杂质含量少，强度高，热稳定性要好，并指出缺陷、杂质组成、含量及存在形式是影响金刚石热稳定性、强度的重要因素。杂质的大量存在导致金刚石的热稳定性急剧下降，温度为１１００ ℃时，尤为明显。 Through heat treatment, acid treatment experiments, the use of X-ray diffraction, emission spectroscopy, XTL-Ⅱ microscopic observations of synthetic diamond more systematic study. The results show that diamond powder synthesized by powder catalyst contains less impurities, higher strength and better thermal stability. It is also pointed out that the defects, impurity composition, content and existing forms are important factors affecting the thermal stability and strength of diamond. The presence of a large amount of impurities leads to a drastic drop in the thermal stability of the diamond, especially at 1100 ° C.