As early as the 7th century AD, Songzan Gambu, a Tibetan national hero, great politician and strategist, unified Tibet. And established a close relationship with the Tang Dynasty. In particular, the marriage between Songzan Gambo and Princess Wencheng has had a far-reaching impact on the ties between Tibetan and Han nationalities and the economic and cultural development of Tibet. By the Yuan Dynasty, Tibet was formally incorporated into the territory of the motherland, ending the long-term division within Tibet, and the people lived a stable life. In the Ming Dynasty, especially in the Qing Dynasty, the ties between Tibet and the motherland were further strengthened, and Tibet's politics, economy and culture were also developed. 179 1 year, the Qing government sent troops to Tibet to fight side by side with people in Xizang, thus safeguarding the reunification of the motherland. Then, the Qing government also agreed with Tibetan local governments on the organization of Tibetan local governments and their political, fiscal, financial, military, diplomatic and religious systems, and submitted them to the Central Committee of the Qing Dynasty for examination and approval before they were formally promulgated. The Minister stationed in Tibet was appointed to supervise Tibetan affairs on behalf of the Qing court, which strengthened the management of Tibet.

In modern times, imperialist forces invaded China and Tibet at the same time. With the support of the people of all ethnic groups throughout the country, people in Xizang bravely resisted imperialist aggression, constantly smashed various separatist activities of imperialism and its pro-imperialists, and safeguarded the reunification of the motherland.

195 1 On May 23rd, the Central People's Government and the local government of Tibet signed the Agreement on Measures for the Peaceful Liberation of Tibet. Since then, the Tibetan nation has been free from imperialist aggression and fetters forever, and has embarked on a bright road of unity, progress and development in the big family of equality, friendship and cooperation among all ethnic groups in People's Republic of China (PRC).