Why did China lag behind foreign countries in science and technology after Ming and Qing Dynasties?

There are many reasons why China's scientific and technological level began to lag behind that of western countries in the Ming and Qing Dynasties. First, the most direct reason is the closed-door policy and the sea ban policy, which directly cut off China's ties with other countries. Then there is the national policy implemented after the end of the Ming Dynasty, which emphasizes agriculture and inhibits business, which makes the seeds of domestic capitalism stifled; Finally, there is the mentality. Both the ruling class and the civilian class in China are dreaming of going to China, and they simply don't care about the outside world and whether it is behind.

In the Ming Dynasty, Zheng He made great achievements in his voyages to the Western Seas. At that time, China was also the world's first power, and Zhu Di was an emperor who made great efforts. At that time, he was able to make some achievements leading the world in mathematics, physics and astronomy. Who knows that the middle and late Ming Dynasty is the era of sudden changes in the world, and the rulers of the Ming Dynasty began the policy of sea ban, and the atmosphere of stereotyped writing for scholars became more and more serious, so the Ming Dynasty slowly lost its connection with advanced productive forces, and the budding capitalism just started went bankrupt.

especially in the Qing dynasty. In fact, Yong Zhengdi, who received the least praise, struggled to support the prosperity of Kanggan, while Qing, as the ruler of ethnic minorities, struggled to manage even the Han people, let alone see the world. Moreover, the emperor of the Qing Dynasty was so arrogant that he paid no attention to foreign envoys who thought China was still a world power. Until the advent of the electrical age in the mid-19th century, the power technology that was used to in Europe and America became a treasure in China.

in a word, the science and technology in Ming and Qing dynasties have been far surpassed by Europe and America. The arrogance of the rulers, coupled with the absolute mistakes in policies, giving up foreign opportunities for immediate peace, and the ignorant thoughts without any creativity have made China, who could have stood out from the crowd, a spent force and completely lost his strength. Sometimes we have to thank the Opium War and the Sino-Japanese War for giving us a good lesson, which taught us a bloody lesson.