The words virtual and reality have contradictory meanings. Putting these two words together seems meaningless, but the development of science and technology has given it new meaning. The clear definition of virtual reality is not easy to say. According to J. Laniar, the scholar who first proposed the concept of virtual reality, virtual reality, also known as virtual reality, means "an artificial world synthesized by electronic computers." It can be clearly seen from this that this field has an inseparable and close relationship with computers, and information science is the basic prerequisite for synthesizing virtual reality. Generating virtual reality needs to solve the following three main problems: ① The existence of technology that can fake the real thing. That is, how to synthesize input information that is consistent with actual existence for the observer's sensory organs, that is, how to produce the same vision, touch, smell, etc. as in the real environment. ②Interaction. How observers can actively and actively operate virtual reality to achieve different viewpoints and higher-level sensory information. In fact, it means how to see things more closely, hear things more truly, etc. ③The reality of self-discipline. How do the feelers get a lifelike sense of reality without being aware of their own movements and behaviors. In order to successfully develop these three technologies, virtual reality must deal with the interrelationship between various elements as shown in the figure below. Here, the observer, sensor, computer simulation system and display system form an interactive closed-loop process. Today, virtual reality has developed into a comprehensive discipline involving computer graphics, precision sensing mechanisms, human-computer interfaces and real-time image processing. Virtual reality technology is divided into two categories: virtual reality (scenery) technology (such as virtual tour of the Palace Museum) and virtual virtual scene (scenery) technology (such as virtual reality environment generation, virtually designed Boeing 777 aircraft, etc.). The application fields and cross-fields of virtual reality technology are very wide, almost to the point of being all-encompassing and pervasive. In the virtual reality technology battlefield environment, virtual reality combat command simulation, aircraft, ships, and vehicle virtual reality driving training, aircraft, missiles, There is a strong market for the application and industry formation of virtual manufacturing of ships and cars (including systematic virtual design), display and tour of virtual reality buildings, virtual reality surgical training, virtual reality games, virtual reality film and television art, etc. Demand and technology driven. Authoritative sources assert that virtual reality technology will be the representative of information technology in the 21st century. Its development will not only fundamentally change people's working methods and lifestyles, work and rest will be truly combined, and people will work in an enjoyable environment and enjoy the work process; but also virtual reality technology will be closely integrated with art, music and other cultural arts. The combination will give birth to the ninth art of mankind. With the development of computer technology, it has become possible to implement virtual reality technology on PCs. Therefore, the current operating trend of virtual reality technology systems is the two main modes of stand-alone desktop and Internet. Therefore, it also has a great stimulating effect on the development and application of computer hardware technology and network technology. People who have been busy in offices in noisy cities for a whole day wish they could step into a tropical paradise. Imagine an endless beach, roll up your trouser legs and stand by the water, letting the waves caress your feet, the coconut trees sing a cappella in the wind, seagulls fly freely, the sun slowly sets in the sky, and the afterglow dyes the sea surface red. This kind of imagination can make many people forget their fatigue, and they create an illusion in their hearts that makes them feel relaxed and happy. But if the scene was three-dimensional and detailed, if you could see yourself picking up a shell with your hands, the illusion would come alive and you would think you had actually been to the island. Now, "rest machines" based on virtual reality technology can provide people with this means of crossing space. The blueprint of a residential community has just been drawn. Before starting construction, can future residents be allowed to walk around their units and put forward their own opinions on environmental facilities, house structure, door and window positions, and decoration? The answer is yes: virtual reality can take you into the future. The picture on the right is a virtual display helmet designed by the Massachusetts Institute of Technology for the International Space Station, where astronauts can conduct simulation training.