本文从McWeeny的Huckel-London微扰近似出发,得出与加合性规律公式相对应的计算稠环芳烃分子的质子化学位移公式,从而说明了加合性规律的量子力学基础.本文提出利用芳香位移概念和Sigma比计算质子化学位移的方法,其物理意义明确、计算简单,且可推广应用于该系列分子取代基质子化学位移的计算. Based on the Huckel-London perturbation approximation by McWeeny, the proton chemical shift formula for calculating condensed protonated aromatic molecules corresponding to the law of additive property is deduced, and the quantum mechanics basis of the law of additive property is illustrated. In this paper, The concept of displacement and the method of calculating proton chemical shift by Sigma ratio have clear physical meanings and simple calculations and can be applied to the calculation of proton chemical shifts of substituents in this series of molecules.