自从得知由宇宙早期第1代结构塌缩形成的星系的物理机制在很大程度上取决于当时气体云的成分[1],大爆炸过程中碳氮氧元素的合成引起了极大的关注。本文给出了在标准大爆炸核合成中起重要作用的反应链,此链是生成碳氮氧元素的主要路径。通过进行标准大爆炸的网络计算来研究从大爆炸过渡到“金属性”的路径,特别是涉及到不稳定核8Li俘获中子反应的路径。最近,中国原子能科学研究院的科研人员运用北京HI-13串列加速器GIRAFFE设备所得到的Ec.m.=7.8MeV的8Li Since we know that the physical mechanism of galaxies formed by the collapse of the structure of the first generation of the early Universe largely depended on the composition of the gas cloud at the time [1], the synthesis of carbon, nitrogen and oxygen atoms in the Big Bang attracted great attention . This paper presents the reaction chain which plays an important role in the standard big bang nuclear synthesis. This chain is the main path to generate carbon and nitrogen oxides. The path from the big bang to the “metallic” path was studied by conducting a network calculation of a standard big bang, especially with respect to the pathways of unstable nuclear 8Li capture neutrons. Recently, researchers from China Institute of Atomic Energy used 8Li of Ec.m. = 7.8 MeV obtained from the Beijing HI-13 tandem accelerator GIRAFFE device