When it comes to 'twins', people will naturally think of them, but with the addition of' numbers', how should we understand it? In fact, digital twins not only appeared in the science fiction works "Three Bodies" and "Iron Man", but also played an important role in the Shenzhou 16 manned spacecraft mission and the Tiangong-1 mission. In the future, digital twins will be more applied in fields such as aerospace, ships, airplanes, healthcare, and smart cities, significantly reducing human mental and physical labor intensity, and significantly improving production safety and efficiency. What is digital twin from science fiction works? Perhaps we can easily understand this concept from science fiction works. The science fiction work 'Three Body' provides a good explanation for digital twins. There is a "three body game" in this novel, which uses digital space to reproduce the actual environment of a three body planet and also reproduces the physical properties of a real three body planet. This virtual gaming world can be seen as a digital twin model of a three body planet. The protagonist Wang Miao can connect and enter the virtual three body planet space through a wearable human-computer interaction device, creating her own digital image in the game world. This digital mirror has exactly the same appearance, behavior, and perception ability as Wang Miao, and their states are real-time and interconnected. That is to say, the cold, pain, and fatigue experienced by the digital mirror in the game will also be transmitted to Wang Miao in real time. In this way, Wang Miao can walk on a three body planet with empathy through the digital mirror in the game, and "personally" experience the chaos, oppression, and danger of the chaotic era. He can also "personally" interact with the digital images of famous characters in the game, such as presenting a "perpetual calendar" to King Zhou with King Wen of Zhou, or communicating with Mozi, Copernicus, Galileo about the sun's movement model of the Eternal Era and the Chaotic Era. In addition, the choices made in the digital twin model of the three body world may trigger the future direction of this world. Everything that happens in the gaming world follows the real world, where the future can be inferred. There are also digital twins in the sci-fi film 'Iron Man'. The protagonist Tony Stark used advanced technology to create a steel armor tailored for himself, equipped with a miniature nuclear power plant, various advanced weapons, and the intelligent system "Jarvis". Jarvis has a built-in digital virtual model of steel armor, which can track the status of steel armor and visualize it for Tony to understand the situation of steel armor and make combat decisions. Jarvis can also provide combat assistance functions such as target targeting, information tracking, and energy warning. The Iron Warrior and Jarvis in Iron Man possess the five core elements of a digital twin system. Steel armor is a physical entity, while the armor model built into "Jarvis" is the corresponding virtual entity, commonly referred to as the "digital twin model" or "digital twin. The data on the degree of damage, flight speed, and energy surplus of steel armor are collectively referred to as twin data. Jarvis analyzes, processes, and mines data, providing combat assistance services such as combat advice, flight trajectory planning, energy warning, etc. These service functions are presented in the form of decision data, charts, analysis curves, etc