The Wubei Zhi, also commonly known by its Japanese translated name Bubishi, is a military book in Chinese history. It was compiled in 1621 by Mao Yuanyi （茅元儀 Máo Yuányí; 1594–1640?), an officer of waterborne troops in the Ming dynasty. The Wubei Zhi contains 240 volumes, 10,405 pages, and more than 200,000 Chinese characters.

Zheng He was a Chinese mariner, explorer, diplomat, fleet admiral, and court eunuch during the early Ming dynasty often regarded as the greatest admiral in Chinese history. He was originally born as Ma He in a Muslim family and later adopted the surname Zheng conferred by the Yongle Emperor. Commissioned by the Yongle Emperor and later the Xuande Emperor, Zheng commanded seven expeditionary treasure voyages to Southeast Asia, South Asia, West Asia, and East Africa from 1405 to 1433. According to legend, his larger ships carried hundreds of sailors on four decks and were almost twice as long as any wooden ship ever recorded.