Check-in system is in great demand both in schools and in companies. In this era of rapid development, the demand is more diversified and personalized. For the problems of time-consuming, laborious and replacing check-in with traditional check-in modes, this design puts forward a check-in system design scheme based on face recognition from the basis of computer vision. Based on OpenCV software library, the image is processed and acquired in real time, and then compared with the information in the database. This design takes the assessment management as the core, which can meet the basic needs of the schools and the companies.