The Ming Dynasty was a period of transition from prosperity to decline in maritime silk trade. The country implemented a sea ban policy to restrict sea trade. Due to constant invasions by the Japanese pirates in the southeastern coastal areas, in the third year of Emperor Hongwu’s reign in 1370, the “Taicang and Huangdu Shibo Si” was abolished to resist the influx of foreign goods. The primary reason was the worsening of Sino-Japanese relations, and the country had no choice but to prevent the “barbarians and cunning individuals from approaching the capital.” In the seventh year of Hongwu’s reign in 1374, the Ming government abolished the “Shibo Si” in Quanzhou, Mingzhou, and Guangzhou. Additionally, in order to protect the tributary trade system, in the fourteenth year of Hongwu’s reign in 1381, the Ming government reinstated the prohibition on coastal residents engaging in private trade with foreign countries.