报道了Ｎ（６甲基２苯并噻唑基）α氨基膦酸二乙酯类化合物的１Ｈ ＮＭＲ 数据，研究了α位苯环上取代基对αＣＨ 的化学位移的影响．根据单晶结构确定了膦酸二乙酯的两个乙氧基的核磁不等价现象是由α位苯环的屏蔽作用造成的．研究了α位苯环上取代基对α位苯环的屏蔽作用的影响，并利用构象重叠方法解释了邻位取代基对屏蔽作用的影响 The 1H NMR data of N (6methyl2benzothiazolyl) αphosphoramidic acid diethyl ester compounds have been reported. The chemical shifts of αCH substituents on α- influences. According to the single crystal structure, it was confirmed that the NMR inequalities of the two ethoxy groups of diethyl phosphonate were caused by the shielding effect of α-position benzene ring. The influence of substituents on the α-position on the para-position of the benzene ring at α-position was studied. The conformational overlap method was used to explain the influence of the adjacent substituents on the shielding effect