What belief is the spiritual driving force of Zheng He's fleet's voyage?

Mazu belief. According to the historical data network, before each voyage, the fleet will "offer sacrifices to kai yang", offer sacrifices to Mazu on board, reward Mazu when returning safely, invite the imperial court to seal and offer sacrifices to Mazu, and build Mazu Palace Temple in Changle, Putian, Quanzhou and other places in Fujian, and set up the tablet of "The Story of Tian Fei's Spirit" and so on. This has effectively promoted the spread of Mazu belief and Mazu culture.