During the Ming period, the emperors sent seven maritime expeditions probing down into the South Seas and across the Indian Ocean . Yongle Emperor ( 明成祖 ) strenuously tried to extend China's influence beyond her borders by encouraging other rulers to send ambassadors to China to present tribute. The Chinese armies reconquered Annam and blocked Mongol expansionism, while the Chinese fleet sailed the China seas and the Indian Ocean, cruising as far as the east coast of Africa . The Chinese gained a certain influence over Turkestan . The maritime Asian nations sent envoys with tribute for the Chinese emperor. Internally, the Grand Canal was expanded to its farthest limits and proved to be a stimulus to domestic trade.

The most extraordinary venture, however, during this stage was the dispatch Zheng He's ( 郑和 ) seven naval expeditions, which traversed the Indian Ocean and the Southeast Asian archipelago. An ambitious Muslim eunuch of Hui descent, a quintessential outsider in the establishment of Confucian scholar elites, Zheng He led seven expeditions from 1405 to 1433 with six of them under the auspices of Yongle. He traversed perhaps as far as the Cape of Good Hope .

The first expedition in 1405 consisted of 62 ships and 28,000 men--then the largest naval expedition in history. Zheng He's multi-decked ships carried up to 500 troops but also cargoes of export goods, mainly silks and porcelains, and brought back foreign luxuries such as spices and tropical woods.

The economic motive for these huge ventures may have been important, and many of the ships had large private cabins for merchants. But the chief aim was probably political, to enroll further states as tributaries and mark the reemergence of the Chinese Empire following nearly a century of barbarian rule. The political character of Zheng He's voyages indicates the primacy of the political elites. Despite their formidable and unprecedented strength, Zheng He's voyages were not intended to extend Chinese sovereignty overseas.