From the aspect of ruling policy, the reasons for the fall of Sui and Tang Xing are explained

The policy of the Sui Dynasty was to concentrate the wealth of the country, which led to the massive accumulation of bureaucratic capital and the low standard of living of the people, which led to the poor livelihood of the people, and finally led to an uprising. This policy had been implemented since the time of Emperor Wen of Sui, and Emperor Yang of Sui's harsh rule only hastened the demise of Sui.

The Tang Dynasty absorbed the experience of the Sui Dynasty and adopted the policy of gathering wealth for the people, which lightened the burden of the people, thereby improving the people's living standards and creating favorable conditions for the prosperity of the Tang Dynasty.

Tang Taizong implemented the uniform land system, the rent was regulated, the land reclamation was rewarded, and "the luxury and the cost were saved, and the light tax was paid", saving the best expenses and reducing the burden on the people. Passed"Mutual market"Let the farmers exchange large quantities of livestock for farming.

In terms of servitude, the number of days of servitude for the common people is reduced, and it is stipulated that servitude can be replaced by payment in kind. In terms of political system:

The Tang Dynasty followed and perfected the Sui Dynasty's "three provinces and six ministries" system. In terms of law: on the basis of the "Sui Law", the decree was revised many times, deleting the complicated and simplifying, and turning the heavy into light.

First of all, it reduced the time for the people to serve labor, and the peasants could also replace the labor by handing over things, and at the same time relaxed the policies of the peasants, and at the same time supported business, and then followed some of the previous policies in the political aspect.

Tang Taizong absorbed the reasons for the fall of the Sui Dynasty, carried out overseas economic exchanges, and also carried out resource exchanges with small neighboring countries to reduce the tax burden for farmers.

Sui Dynasty: Emperor Yang of Sui repeatedly launched wars to labor the people and consume money, which eventually caused a serious crisis of rule, as early as the sixth year of Emperor Yang of Sui (610), because of the resistance to the conscription of the government military system, four popular uprisings broke out, but were quickly suppressed by the Sui army. In the seventh year of Emperor Yang of the Sui Dynasty (611), the middle and lower reaches of the Yellow River in the eastern part of the Kanto region (Yuzhou Road, Jizhou Road, Yanzhou Road) flooded and flooded more than 40 counties.

At that time, most of the popular uprisings were concentrated in Yuzhou Road, Jizhou Road, Yanzhou Road, Qingzhou Road and Xuzhou Road in the eastern part of the country, and were soon suppressed by the Sui army. In 613, Liu Yuanjin entered Wu County, proclaimed himself the Son of Heaven, and was destroyed in the same year. Until Yang Su's son Yang Xuangan raised troops to rebel in Liyang (now northeast of Jun County, Henan), the children of high-ranking officials of the Sui Dynasty participated one after another, leading to rebellions throughout the country.

The Sui court quickly collapsed under this situation. On April 10, 8, Yu Wenhua, Sima Dejiao, Pei Qiantong and others launched a mutiny, killed Emperor Yang of Sui, and established Yang Hao as emperor. On June 12, 618, Li Yuan forced Emperor Gong of Sui to take the throne, and on June 18, 618, Li Yuan officially proclaimed himself emperor and established the Tang Dynasty as the ancestor of the Tang Dynasty.

Tang Dynasty: During the Tianbao period, politics gradually became chaotic, and the Anshi Rebellion broke out in 755, and the Tang Dynasty turned from prosperity to decline. During the Middle Tang Dynasty, the Tang Dynasty was affected by internal and external troubles such as the three towns of Heshuo, the invasion of Tibet, the dictatorship of eunuchs, and the party struggle between Niu and Li.

During this period, although there were Tang Xianzong's Yuanhe Zhongxing, Tang Wuzong's Huichang Zhongxing and Tang Xuanzong's Dazhong temporary rule, but they were unable to ** the internal and external troubles of the Tang Dynasty. In the late Tang Dynasty, due to political corruption, the late Tang Dynasty civil uprising broke out, in which the Huangchao Rebellion destroyed the economy of the south of the Yangtze River, causing the Tang Dynasty economy to completely collapse, leading to the nationwide division of feudal towns, and the Tang dynasty was finally controlled by the feudal town Zhu Quanzhong. He forced Tang Zhaozong to move the capital to Luoyang, and in 907 forced Emperor Tang Ai to take the throne, and Tang died for a total of 289 years.

Zhu Quanzhong founded the Liang, known as the Later Liang in history, and entered the period of five dynasties and ten kingdoms.

From the Book of Sui and the Book of the Later Tang Dynasty

The prosperity of the Sui and Tang dynasties made the country strong, the culture prosperous, and the territory expanded to the west of Afghanistan today. Cultural prosperity means freedom, and freedom is easy to breed disorder, and the country is strong and prosperous, which can easily lead to military decline. The vast territory means that it is difficult to govern, and the appearance of governance is chaotic. Although there are so many reasons, there must always be an introduction to detonate the bomb of this crisis.

And this introduction is the Battle of Darros, the general Gao Xianzhi because of the benefits of a small country, and the Arab Empire at war, the command is unfavorable to the defeat, this defeat made the Tang Empire's god-like image began to shake, and as the adopted son of the Tang Ming Emperor, An Lushan has long been waiting for such an opportunity, taking the opportunity to make chaos, the long-term stability of the Tang Empire makes there is no emergency mechanism to fight this crisis, and the country collapses like a domino card in an instant. After the Battle of Darros, the Chinese civilization also gave up the throne of the world's first civilization and withdrew from the stage of world lords.

The most important political system innovation of the Sui and Tang dynasties was the imperial examination system during the Yang Emperor period of the Sui Dynasty, which had the greatest influence on later generations, especially on the Ming and Qing dynasties, and played an indispensable role in the development of Chinese culture.

In terms of selecting talents, the imperial examination system.

In the selection and employment of people, the judgment of body and word.

**In terms of system, three provinces and six ministries.