**

When Zhang Qian returned from his mission, he laid out a sheepskin map on Emperor Wu's desk, which clearly outlined an unknown territory and unknown country, and the ancient country of the Western Regions came into people's sight. Emperor Wu's eyes passed through the city wall of Chang'an and went to the edge of the Gobi desert. This land would eventually be hung with a battle flag with the word "Han", and the four hundred years of history of the Western Regions would begin here. It starts with the story of the Han Empire and the ancient countries in the Western Regions, puts the Han, the Huns, and the Western Regions on the same era, and focuses on the life-and-death game between the Han and the Xiongnu in the Western Regions. The book uses historical facts as the basic framework, and the language style is popular and relaxed, without boring academic theories. It focuses on story-based narrative, and clearly shows the history of the love, murder, and integration of various ancient countries in the Western Regions and the Han Dynasty. This is not only the 400 years of the Western Regions, but also the "400 years of the Han Dynasty" and the "400 years of the Huns".