Destroying the six countries and reunifying China ended the long-term separatist melee, complied with the wishes of the broad masses of people, established feudal autocracy and centralized power, and promoted economic and cultural exchanges among all ethnic groups in various regions, which had a far-reaching impact on future generations. The above shows Qin Shihuang's great contribution to the history of China. However, he was also a brutal feudal emperor. He built palaces and mausoleums extensively and enforced cruel laws, which affected people's normal production and life, made people live in dire straits, burned books and buried Confucianism, stifled ideas and destroyed culture. Compared with the merits and demerits, Qin Shihuang's merits and demerits were greater than his faults.