" Twenty Thousand Miles Under the Sea " was a French story about his underwater exploration of the Amazon River basin. The theme of the work was science, exploration, human destiny, and the development of civilization. One of the main topics of his work was science and exploration. Through the protagonist, Dr. Foch, the prime minister of the Duchy of the Netherlands, Verne showed the readers how human ignorance and misunderstanding of the ocean and marine life, as well as how the progress of science and technology promoted the pace of human exploration of the new world. At the same time, he also discussed the fate of explorers and the price of adventure, as well as the importance of exploration for the development of civilization and social progress. The second theme of the work was the fate of mankind and the development of civilization. In the novel, Verne described the conflicts and exchanges between different civilizations, as well as the control and utilization of the ocean and natural forces by humans. Through the protagonist, Dr. Foch, the prime minister of the Duchy of the Netherlands, he showed the readers the progress and limitations of human technology and civilization, as well as the imagination and planning of human beings for the future. The third theme of the work was the clash of civilizations and cultural differences. The communication and conflict between different civilizations was an important theme in the novel. The differences in values, beliefs, and ways of life between different civilizations led to conflicts and misunderstandings. In the process of exploring the Amazon River basin, the protagonist, Dr. Foch, also faces the challenges of conflicts between different civilizations and cultural differences. He needs to resolve these contradictions through his wisdom and courage. Twenty Thousand Miles Under the Sea was a science fiction novel full of science, exploration, human destiny and the development of civilization. It was one of Verne's representative works and a classic in the history of science fiction.