Zhang Qian was sent to Dawan and Ren Yue to contact Ren Yue and jointly defend the Huns. But he was captured by the Huns, imprisoned by the Huns for ten years, married and had children, thinking about the big man and waiting for an opportunity to escape. Later, she escaped, but Yueshi had been attacked by Wusun and Xiongnu and moved westward. Zhang Qian had to cross the Gobi desert, over the iceberg, through Dawan and Kangju, and wait until the new frontier of the moon. Now the moon is too far away from the big fellow and too worried about peace to move eastward. Zhangqian worked hard for a year, but he got no support. She had to go south to Daxia, and heard that Daxia could do business with China and Sichuan. On his way home, Zhang Qian changed to the South Island, which was also controlled by the Huns. They were caught by the Huns and detained for another year. They just went to the Huns for civil strife and took the opportunity to escape. It is difficult to March, and it belongs to the big man, and it belongs to two people. Zhang Qian's mission, although not allied with Yue's people to attack Xiongnu, made China's influence reach West Asia for the first time since Qin Shihuang!

Zhang Qian returned to China, and advised Emperor Wu of the Han Dynasty to go straight from Sichuan to the southwest, where he was exposed to ptomaine. So under his auspices, the four teams marched to the southwest. Although India was not discovered due to the prevention of countries along the way, Yunnan and Yelang were discovered, and the development and control of Yunnan, Guizhou, Sichuan and Tibet in the southwest today were finally completed.

The year before and the year after, he searched for drugs, and Zhang Qian went out with the army twice. With his extensive knowledge and familiarity with Xiongnu, he served as a guide for generals such as Wei Qing and Li Guang, and made great contributions, and was finally regarded as a Bo prince.

Many parts of China's present territory were laid in the coming year by Emperor Wu of the Han Dynasty. Of course, there is also Zhang Qian's contribution!