Abstract: The Internet of things uses in various fields,which is of great convenience to people's lives. Health monitoring can provide users with convenient and reliable health services, which are of low cost The current health monitoring systems depend on the instruments. Based on the Internet of things and expression recognition, a system called NCHMS was proposed, which monitors the health status with no contact. This article elaborated on the structures and functions of NCHMS system, improved the expression classification space for health monitoring, and gave a detailed expression recognition algorithm. The experimental data from the simulated experiments can tell that the system has considerable feasibility and practicality. Internet of things, Expression recognition, Health monitoring, Non-contact

Key words: Internet of things, Expression recognition, Health monitoring, Non-contact