With the rapid development of computers and the internet, information security is particularly important. In the past, identification is mainly used with passwords or ID cards, but it is easy to be stolen or forgotten. However face recognition systems can quickly and simply solve the problem, so currently, it begins to be widely used in various field. This passage will mainly introduce the application of face recognition system by reading a lot of literature. In the first section, the passage will provide the definition of face recognition system and its basic working principle. It is reported that the face recognition system has developed from simple rule-based recognition to mechanized automatic recognition. Afterwards, the application of face recognition system in various aspects will be introduced in this passage, it includes five broad applications in the financial field, education field, transportation field and public security field. In conclusion, now the world becomes more and more better because of the advance in science and technology, so face recognition is slowly recognized by people, and we also began to use it in different fields.