本文运用ＣｄＮＯＲ 银染技术，对１２３ 例正常人Ｄ、Ｇ 组染色体小Ｃｄ、“ＣｄＮＯＲ”融合作了分析，结合发现：１ ，Ｄ、Ｇ组染色体出现小Ｃｄ 的频率显著高于其理论预期值；２－Ｇ 组染色体“ＣｄＮＯＲ 融合”频率明显高于其理论预期值；３－Ｄ、Ｇ 组小Ｃｄ 和ＣｄＮＯＲ融合频率在男女之间没有明显差异。本文还对Ｄ、Ｇ 组近端着丝粒染色体易于不分离的原因进行了探讨，提出了新的解释。 In this paper, we analyzed the fusion of small Cd and “CdNOR” chromosomes in 123 normal D and G chromosomes using Cd  NOR staining and found that the frequency of small Cd in chromosomes 1 and D and G was significantly higher The frequency of “CdNOR fusion” in 2-G group was significantly higher than its theoretical value. There was no significant difference in the frequency of small Cd and CdNOR fusion in 3-D and G groups between men and women. This article also on D, G group proximal centromeric chromosomes are not easy to separate the reasons were discussed, put forward a new explanation.