Zhang Sai was from Tianshui, Gansu Province; Zhang Qian was from Chenggu, Hanzhong County (now Chenggu County, Hanzhong City, Shaanxi Province).

Zhang Sai is a doctor, doctor and professor at the Specialty Medical Center of the Chinese People’s Armed Police Force. His main research direction is the treatment of acute and severe craniocerebral trauma. He is currently the dean, professor and chief physician of the Neurosurgery Department of the Affiliated Hospital of the Medical College of the Chinese People's Armed Police Forces, and a professor and graduate tutor of the Neurosurgery Department of Tianjin Medical University.

Zhang Qian, courtesy name Ziwen, was an outstanding diplomat, traveler, explorer and pioneer of the Silk Road in the Han Dynasty of China. My hometown is Bowang Village on the bank of the Han River, 2 kilometers south of Chenggu County, Hanzhong City, Shaanxi Province. Zhang Qian is full of pioneering and adventurous spirit. In the second year of the founding of the Western Han Dynasty, under the orders of Emperor Wu of the Han Dynasty, he led more than a hundred people on an envoy to the Western Regions and opened up the north-south road from the Han Dynasty to the Western Regions, which was the famous "Silk Road".

Zhang Qian’s achievements

Zhang Qian was not afraid of dangers and went on two missions to the Western Regions, communicating China’s commercial relations with West Asia and Europe, and opening up the famous “Silk Road” in history. ". Zhang Qian returned to the Han Dynasty on his second mission to the Western Regions and brought envoys from the Wusun Kingdom. The Wusun Kingdom and the Western Han Dynasty began to have friendly exchanges on the basis of equality. Within a year after that, the deputy envoys sent by Zhang Qian to the Wusun Kingdom and the envoys from the Western Regions countries also returned to the Han Dynasty one after another. The Han Dynasty and the Western Regions countries officially began equal and friendly exchanges.

Zhang Qian was sent as an envoy to the Western Regions and came into contact with the customs and customs of the countries in the Western Regions. It was the Han Dynasty that began to understand the countries in the Western Regions, which enabled the Han Dynasty to establish friendly relations with the Western Regions, and set up the Western Regions Protectorate for the later Western Han government. , which laid the foundation for the Western Regions to be formally placed under the jurisdiction of the Western Han government.