Hisign face recognition technology has experienced more than ten years of development from LDA to deep neural network, and has continuously achieved breakthroughs in recognition accuracy. It has been widely used in fields such as large data search, human verification, and video surveillance. In 2010, when deep learning has not been popularized, it has successfully realized hundreds of video surveillance face recognition and hundreds of millions of large-scale data searches at the Shanghai World Expo. Hisign's face recognition algorithm has continued to play a huge role in the face recognition system for populations with a capacity of more than 1.5 billion since 2016. In the public security checkpoints and other transportation junctions, Hisign's personnel verification equipment has played a technical guarantee role for public security.