Light nuclei with mass number of below 8 are considered to be produced by the so-called the Big-bang nucleosynthesis (BBN) occurring in the early universe. Since BBN depends on various assumptions related to the origin of the universe and the laws of fundamental interactions and elementary particles, those assumptions can be verified by comparing the abundances of light isotopes calculated with BBN and the astronomically observed ones. Since the neutrons are the starting materials of BBN together with protons, and also they are electrically neutral, they play a unique and critical roles in BBN. In this paper status of the BBN analysis and experimental studies of the properties of neutrons relevant to BBN will be reviewed.

质量数低于8的轻核被认为是由早期宇宙中发生的所谓大爆炸核合成（BBN）产生的。由于BBN依赖于与宇宙起源以及基本相互作用和基本粒子定律相关的各种假设，因此可以通过比较BBN计算的轻同位素丰度和天文观测到的轻同位素丰度来验证这些假设。由于中子与质子一起是BBN的起始材料，而且它们是电中性的，因此它们在BBN中发挥着独特而关键的作用。本文对BBN分析以及与BBN相关的中子性质的实验研究现状进行综述。