In ancient times, fingerprints were not used to compare fingerprints, but were recognized as personal signatures. At that time, most people had no chance to read and write. So, if there were documents that needed to be confirmed by personal signature at that time, if you couldn't even write your own name, how could you show your personal signature right? They only need to press their fingerprints, so gradually, even some literate people will press their fingerprints to show their formality when they need to sign and confirm certain documents. As for identity, that is. China is recognized as the birthplace of "fingerprint" in the world, and its application history is very long. Tracing back to the fingerprint history of the Chinese nation can be traced back to the middle Neolithic age 6000 years ago. The pottery unearthed from Banpo site is printed with clearly visible fingerprint patterns. There are three groups of geometric curve paintings on the ancient pottery pot found in Hongshan Culture site (now Hongshan, Dong Xiao, Chifeng City, Inner Mongolia) 5,000 years ago, which are three identical and typical dustpan-shaped fingerprint paintings. Each fingerprint painting has a central line and six peripheral lines. In Majiajiao culture located in Liuwan Cemetery, Ledu County, Qinghai Province, a 5000-year-old portrait fingerprint painted pottery pot was unearthed. There are four original paintings of spiral fingerprints on it. The details of the starting point and ending point of the ridge line are obvious. Draw a triangle between the two groups of paintings, and the central pattern matches the left and right triangle patterns to form a complete barrel-shaped fingerprint painting.

Fingerprint experts confirmed that fingerprints were once the template for ancient people to design pottery patterns. Archaeologists named geometric patterns on Neolithic pottery, such as wave patterns, arc patterns, circular patterns, arc patterns, vortex patterns, thunder clouds and so on, with various fingerprints. This is an accurate and vivid fingerprint painting based on rich experience in fingerprint observation. The success of this creation is a re-creation based on a deep understanding of fingerprint characteristics, and it is a prelude to the understanding of fingerprints. China is the earliest security measure to use fingerprints in ancient times. During the Qin and Han Dynasties (2265438 BC+0-25 AD), the system of sealing mud prevailed. At that time, most public and private documents were written on wooden slips or bamboo slips. When it is delivered, it is bound with a rope, and both ends or intersections of the rope are sealed with mud, and stamped with a seal or fingerprint as a credit check to prevent unauthorized disassembly. This mud fingerprint, as a personal identification, also indicates truth and loyalty. It can also prevent counterfeiting. This security measure is reliable and easy to implement. The first contract document printed with fingerprints in ancient China. 1959 A Tibetan document of the Tang Dynasty (borrowed from Su Qi) was unearthed in the ancient city of Milan, Xinjiang. This deed is written in thick brown paper, 27.5 cm long and 20.5 cm wide. Tibetan is black, and there are four red handprints at the signature. One of them can see the ridge line, and it can definitely be a fingerprint. In addition, during the Song Dynasty in China, evidence and science were emphasized. At that time, fingerprints had been used as material evidence in formal criminal cases. The Biography of Yuanjiang in Song Dynasty records the story of Yuanjiang's use of fingerprints to judge cases.