Human Machine Interaction (HMI), also known as user interface or user interface, is a medium and dialogue interface for transferring and exchanging information between people and computers, and is an important part of computer systems. It is the medium for interaction and information exchange between the system and the user, which realizes the transformation between the internal form of information and the acceptable form of human beings. There are human-machine interfaces in all fields of human-computer information exchange.

The human-machine interface refers to the field in which people and machines contact or interact with each other in information exchange and function, or the interface between the human and the machine. The information exchange, functional contact or mutual influence refers to the hard contact and soft touch of the person and the machine. The joint surface includes not only the direct contact of the point line surface, but also the space for the long-distance information transmission and control. The human-machine interface is a central part of the human-machine system. It is mainly studied and proposed by the sub-discipline safety ergonomics of safety engineering, and has passed safety engineering equipment engineering, safety management engineering and safety system. Engineering to study specific solutions means measures safety ergonomics. It transforms between the internal form of information and the form that humans can accept. There are human-machine interfaces in all fields of human-computer information exchange. It is widely used in industry and commerce. It is simply divided into "Input" and "Output". Input refers to the operation of machinery or equipment by people, such as handles, switches, doors, commands. (Command) release or maintenance, etc., and output refers to notifications sent by machinery or equipment, such as faults, warnings, operating instructions, etc. Good human-machine interface will help users to be simpler, more correct, and more The rapid operation of the machine can also maximize the performance of the machine and prolong its service life. The human-machine interface on the market is narrowly defined in the user-friendly operating interface of the software.