本文根据拓扑理论和前报研究的结果 ,继续对氢化物HnA -H型分子中A -H键伸缩力常数KA -H的递变规律进行了探讨 发现A -H键伸缩力常数KA-H与我们提出的拓扑指数YM及其本身的键长rA -H有良好的线性关系 新方法形式简洁、计算方便、物理意义明确 ,很好地解释了氢化物HnA -H型分子中A -H键的伸缩力常数KA-H的递变规律 本文还从理论上对新公式进行了证明 ,说明我们的方法是可靠的 Based on the topological theory and the results of the former report, we continue to investigate the regularity of the KA-H stretching constants of A-H bond in HnA-H hydride molecule. It is found that the KA-H Our proposed topological index YM and its own bond length rA -H has a good linear relationship. The new method is simple in form, convenient in calculation and clear in physical meaning, which can well explain the A-H bond in the HnA-H type hydride molecule Tensile Law of KA-H of Retractable Force Constant The paper also proves the new formula theoretically, which shows that our method is reliable