The Ming fleets led by Zheng He made repeated voyages to Southeast Asia, South Asia, and the coasts of the Indian Ocean. Their activities included diplomacy, trade, and maritime exchange.
Voyage records and related texts help researchers study the routes. Ship sizes and some details still require careful comparison of evidence rather than reliance on popular imagination.
Expeditions
The Yuan dynasty and the expanding Sino-Arab trade during the 14th century had gradually expanded Chinese knowledge of the world since "universal" maps previously displaying only China and its surrounding seas began to expand farther and farther southwest, with much more accurate depictions of the extent of Arabia and Africa. Between 1405 and 1433, the Ming government sponsored seven naval expeditions. The Yongle Emperor, disregarding the Hongwu Emperor's expressed wishes, designed them to establish a Chinese presence and impose imperial control over the Indian Ocean trade, impress foreign peoples in the Indian Ocean basin, and extend the empire's tributary system. It has also been inferred from passages in the History of Ming that the initial voyages were launched as part of the emperor's attempt to capture his escaped predecessor, which would have made the first voyage the "largest-scale manhunt on water in the history of China."
Zheng He was placed as the admiral in control of the huge fleet and armed forces that undertook the expeditions. Wang Jinghong was appointed as second in command. Preparations were thorough and wide-ranging, including the use of so many linguists that a foreign language institute was established at Nanjing. Zheng He's first voyage departed 11 July 1405, from Suzhou and consisted of a fleet of 317 ships holding almost 28,000 crewmen.
Zheng He's fleets visited Brunei, Java, Siam (Thailand), Southeast Asia, India, the Horn of Africa, and Arabia, dispensing and receiving goods along the way. Zheng He presented gifts of gold, silver, porcelain, and silk, and in return, China received such novelties as ostriches, zebras, camels, and ivory from the Swahili Coast. The giraffe that he brought back from Malindi was considered to be a qilin and taken as proof of the Mandate of Heaven upon the administration. The Daxuexi Alley Mosque in Xi'an has a stele dating to January 1523, inscribed with Zheng He's fourth maritime voyage to Tianfang, Arabian Peninsula.
While Zheng He's fleet was unprecedented, the routes were not. His fleet followed long-established, well-mapped routes of trade between China and the Arabian Peninsula that had been used since at least the Han dynasty. That fact, along with the use of a more-than-abundant number of crew members who were regular military personnel, leads some to speculate that the expeditions may have been geared at least partially at spreading China's power through expansion. During the Three Kingdoms Period, the king of Wu sent a 20-year diplomatic mission led by Zhu Ying and Kang Tai along the coast of Asia, which reached as far as the Eastern Roman Empire. After centuries of disruption, the Song dynasty restored large-scale maritime trade from China in the South Pacific and Indian Oceans and reached as far as the Arabian Peninsula and East Africa.
When his fleet first arrived at Malacca, there was already a sizable Chinese community. The General Survey of the Ocean Shores (Yíngyá Shènglǎn), composed by the translator Ma Huan in 1416, gives very detailed accounts of his observations of people's customs and lives in the ports that they visited. He referred to the expatriate Chinese as "Tang" people.
The fleet included troops, their purpose was to demonstrate the Middle Kingdom's strength. However, a contemporary reported that Zheng He "walked like a tiger" and did not shrink from violence when he considered it necessary to impress foreign peoples with China's military might. He ruthlessly suppressed pirates, who had long plagued Chinese and Southeast Asian waters. For example, he defeated Chen Zuyi, one of the most feared and respected pirate captains, and returned him to China for execution. After this, the Ming established Old Port Pacification Superintendency at Palembang, appointing prominent local Shi Jinqing as its superintendent. He later waged a land war against the Kingdom of Kotte on Ceylon, and he made displays of military force when local officials threatened his fleet in Arabia and East Africa. From his fourth voyage, he brought envoys from 30 states, who traveled to China and paid their respects at the Ming court.