The similarities and differences between Qin Dynasty and Sui Dynasty are as follows: (1) Both feudal dynasties unified China after a long period of division; (2) They have established some groundbreaking political systems, which have a far-reaching impact on later generations. For example, the autocratic centralized system in the Qin Dynasty, the three provinces and six departments system in the Sui Dynasty, the imperial examination system and the substitution of service by mediocrity. (3) There are great projects that attract worldwide attention, such as the Great Wall of Wan Li in Qin Dynasty and the Grand Canal in Sui Dynasty. (4) The rulers attach great importance to border areas and strengthen relations with ethnic minorities. For example, the Qin dynasty strengthened the jurisdiction and development of the southern Yue nationality areas, and the Sui dynasty sent people to the western regions to make peace. (5) all died because of the large-scale peasant uprising caused by large-scale construction and tyranny. (6) They all provided lessons for later feudal dynasties. The western Han dynasty accepted the lesson of Qin's death and implemented the policy of rest and recuperation; The Tang Dynasty accepted the lessons of the demise of the Sui Dynasty, adjusted its ruling policies, and produced prosperity. Differences: (1) Different ways to gain political power. Ying Zheng inherited the throne, then annexed six countries and established the Qin Dynasty. Emperor Wen of Sui seized power as a consort, established the Sui Dynasty, and later destroyed Chen to unify the north and the south. (2) Times have changed. When Qin was unified, it was in the initial development period of feudal society; After the unification of Sui Dynasty, feudal society began to prosper. (3) The founding emperors had different emphases in governing the country, so their influence was different. Qin Shihuang paid more attention to politics and concentrated on establishing and consolidating a centralized country; Emperor Wendi of Sui paid more attention to economy than politics, and implemented the system of land equalization and tenancy adjustment. Therefore, the autocratic centralization of authority of the Qin Dynasty had a far-reaching influence on later generations. The Sui Dynasty provided rules for the Tang Dynasty system and laid the foundation for the prosperity of feudal society. (4) Different policies towards intellectuals. The Qin dynasty burned books to bury Confucianism and stifled thoughts; The Sui Dynasty implemented the imperial examination system to attract scholars.