" The Three-Body Problem " was a novel by the Chinese science fiction writer Liu Cixin. It told the story of the interaction between the Earth civilization and the alien civilization. The background of the story was that in the early 21st century, a disaster occurred on a planet called " Three-Body ", which led to the deterioration of the entire planet's environment and the extinction of life. However, there was a mysterious life form on this planet-the " Three-Body People ". They had highly developed technology and wisdom and had begun to explore the universe. The protagonist of the story was the Earth scientist Ye Wenjie. She discovered the existence of the Three-Body Man by chance and started to contact and communicate with the Three-Body Man. As the story unfolded, Ye Wenjie and other scientists gradually discovered that the core of the Trisolan civilization was a star called the Trisolan Star. There was a mysterious civilization on this star, and they had been conducting a mysterious experiment in an attempt to evolve the civilization to a higher stage. At the climax of the story, Ye Wenjie and other scientists discovered a theory called the "Dark Forest Law". This theory believes that civilizations in the universe are competing and threatening each other, and each civilization must fight for its own survival. In this context, Earth's civilization had to face the invasion and threat from the Trisolan. Ye Wenjie and other scientists had to invest in this cosmic war to try to protect the survival of Earth's civilization. " The Three-Body Problem " was a novel full of imagination and science fiction elements. Through the exploration and thinking of the universe, it presented a universe full of unknown and mysterious worlds, and also revealed the fragility of human civilization and the uncertainty of the future.