Why did Zheng He go to the West seven times?

Zheng He's voyages to the West had three main influences: 1, which opened up overseas trade and changed the sea ban policy since Zhu Yuanzhang, the Ming emperor, to some extent; 2. Make the Ming Dynasty establish a Chinese and foreign military system in Southeast Asia; 3. Zheng He's voyage to the West strengthened the communication between Chinese and foreign civilizations, promoted the understanding of the outside world in the Ming Dynasty, and left behind geographical works and nautical charts introducing coastal countries and regions.

Zheng He's voyage to the Western Ocean was the largest and longest voyage in ancient China, with the largest number of ships and sailors. It is also the largest series of maritime expeditions in the world history before the voyage of the great discovery of European geography at the end of 15. Zheng He made seven voyages to the West, starting from Longjiang Port in Nanjing, Liujia Port in Taicang and Taiping Port in Changle, Fuzhou.

The recovery and development of industry and commerce in the early Ming Dynasty, the development of China's overseas trade since the Song and Yuan Dynasties, and the increase of foreign immigrants all prepared a solid economic foundation and material conditions for Zheng He's voyage to the West.

After good economic development, it is very urgent to develop overseas transportation and overseas trade. China's silk and porcelain are welcomed by western countries and have won a high reputation. China also has a great demand for spices and other things that cannot be produced by itself.

The development of shipbuilding, the use of compass, the accumulation of navigation experience and the training of a large number of sailors.