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Nearly 500 years ago, Zhu Yuanzhang promulgated a ban on maritime trade. From then on, few foreign maritime trades were seen on China's large seas. 500 years later, western invaders forced Qing Dynasty to open China by means of cannons.

What was the content of the ban promulgated by Zhu Yuanzhang ? Why did he enact such a ban Why can this ban be implemented in a period as long as 500 years? In order to make a comprehensive view of the ups and downs in this 500-year-old history, we have to study this ban on maritime trade.