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summary: Simulation technology, or simulation technology, is a technology that uses one system to imitate another real system. In a narrow sense, it refers to a new type of experimental research technology that was gradually formed in the 1940s with the development of computer technology. ； In a broad sense, simulation has been effectively used in the process of human beings understanding the objective laws of nature. Due to the development of computers, simulation technology has gradually formed its own system and has become the third basic method for humans to understand the objective laws of nature after mathematical reasoning and scientific experiments. It is also developing into a universal and strategic technology for humans to understand, transform and create the objective world. 1. Concept introduction People’s expectations for simulation technology are getting higher and higher. In the past, people only used simulation technology to simulate a certain physical phenomenon, device or simple system ； Today, people require the ability to use simulation technology to describe complex systems, even systems composed of many different systems. This requires that simulation technology needs to be further developed and absorb and integrate other related technologies. Virtual reality technology, referred to as VR, is a new comprehensive integration technology that emerged in the 1980s, involving computer graphics, human-computer interaction technology, sensing technology, artificial intelligence, etc. It is an artificial environment of three-dimensional information composed of computer hardware, software and various sensors - a virtual environment. It can realistically simulate things and environments in the real world (even those that do not exist). When people enter this environment, they immediately feel like "being there", and can operate it in person and interact with the virtual environment naturally. VR technology has three main meanings:: First, the computer-generated environment is illusory ； Second, people’s feelings about this environment (seeing, hearing, touching, smelling, etc.) are realistic ； Third, people can interact with the environment through natural methods (manual, eye movements, spoken words, other body movements, etc.), and the virtual environment can also respond accordingly in real time. Virtual simulation technology is a more advanced simulation technology that combines simulation technology with virtual reality based on the rapid development of information technology such as multimedia technology, virtual reality technology, and network communication technology. Virtual simulation technology is typically characterized by building a unified and complete virtual environment for the entire system, and integrates and controls numerous entities through the virtual environment. The entity can be a simulator, other virtual simulation systems, or can be represented by some simple mathematical models. Entities interact in the virtual environment or interact with the virtual environment to express the real characteristics of the objective world. The integration, virtualization and networking characteristics of virtual simulation technology fully meet the development needs of modern simulation technology. 2. Basic features (1) In the immersive virtual simulation system, users can obtain multiple perceptions such as vision, hearing, smell, touch, and motion, thus giving them an immersive experience. An ideal virtual simulation system should have the function of providing all perceptual information to people. (2) In the interactive virtual simulation system, not only can the environment affect people, but people can also control the environment. People can also control the environment with almost natural behaviors (their own language, body movements, etc.), and the virtual environment can also respond to people's operations in real time. For example, when the pilot presses the missile launch button, he will see the virtual missile launch and track the virtual target. ； When the missile hits the target, it explodes, and explosive debris and fire can be seen. (3) Illusion means that the environment in the system is virtual and is simulated by humans using computers and other tools. It can not only simulate the environment that has existed before in the objective world or that really exists now, but it can also simulate the environment that does not currently exist in the objective world but may appear in the future. It can also simulate the environment that does not exist in the objective world but only belongs to people's imagination. (4) Realism The realism of the virtual simulation system is reflected in two aspects:: On the one hand, the various feelings given by the virtual environment are very similar to the simulated objective world. Everything feels so realistic, just like in the real world. ； On the other hand, when people act on the virtual environment with natural behaviors, the environment's response also conforms to the relevant laws of the objective world. For example, when a force is applied to a virtual object, the movement of the object will comply with the laws of mechanics and will produce corresponding acceleration along the direction of the force. ； When it encounters an obstacle, it will be blocked. 3. Conclusion Because the use of electronic virtual simulation technology to design electronic products has the characteristics of high safety factor, low investment in equipment, short cycle, and high performance, Yuandao Technology applies the technology of virtual simulation system to the chemical industry to provide new ideas for the education and training of universities and petrochemical enterprises.