测定了铋（Ⅲ）与对溴偶氮氯膦（ＣＰＡＰＢ）显色反应的电子光谱，λｍａｘ＝７３５ｎｍ．研究了ｐＨ值、ＣＰＡＰＢ用量和显色时间对配合物稳定性的影响，在最佳条件下确定了配合物的组成Ｂｉ（Ⅲ）∶ＣＰＡＰＢ＝１∶３．并用改善的яцииирскпй方法求出Δε３＝３．２２×１０４，β３＝１．９６×１０１３，配合物平均（表观）摩尔吸光系数的实验值Δε实验与其计算值Δε计算比较，基本一较． The electronic spectrum of the color reaction of bismuth (III) with p-bromophosphoramidite (CPAPB) was determined, λ max = 735 nm. The effects of pH value, amount of CPAPB and color reaction time on the stability of the complex were studied. The composition Bi (Ⅲ): CPAPB = 1: 3 was determined under the optimal conditions. Δε3 = 3.22 × 104 and β3 = 1.96 × 1013 were obtained by using the improved яцииирскпй method. The experimental results Δε of the average (apparent) molar extinction coefficient of the complexes are basically compared with the calculated values ​​Δε.