HMI has many advantages, such as rich display, large memory and powerful configuration function, and using a simple man-machine interface can easily realize human-computer interaction function in various industrial automation fields.HMI products are composed of hardware and software. The hardware includes processors, display units, input units, communication interfaces, and data storage units. The performance of the processor determines the performance of the HMI product, which is the core of the HMI. unit. Depending on the product level of the HMI, the processor can choose 8-bit, 16-bit, and 32-bit processors. The future development trend of human-machine interface is six modernizations: platform embeddedness, brand nationalization, intelligent equipment, stylish interface, communication network and energy saving and environmental protection.