The reason why ancient people wrote science fiction stories could be traced back to the imagination and exploration spirit of ancient humans. In early human culture, people often imagined what the future world would be like and tried to convey this imagination through literature. In ancient times, science fiction was mainly a literary form that expressed the author's imagination and exploration of the future by describing the future technology, society, and the fate of mankind. These stories often have to do with human curiosity about nature and technology because these fields have been the focus of exploration in early human culture. Some ancient sci-fi stories also reflected the author's views on society and politics. For example, the Galaxy Empire series of novels described a galaxy empire ruled by aliens, reflecting the author's views on aliens and alien culture. Ancient people wrote science fiction stories mainly to express their imagination of the world and the future, as well as their curiosity about nature and technology. At the same time, it also reflected the author's views on society and politics.