China is a big agricultural country. In agricultural production, people need to master the knowledge of astronomical calendar, and the study of astronomical calendar can not be separated from mathematical calculation, so in ancient China, the knowledge of mathematics and astronomical calendar was equally valued. There are some carving symbols in the pottery and pottery fragments unearthed from Jiangzhai site in Lintong in the middle Neolithic period. There are different opinions about these carved symbols, both written and digital. We speculate that some of these symbols may represent numbers, which are the precursors of numbers.