 In 1421 Hong Bao participated in the sixth voyage of Zheng He, during which foreign envoys were transported back to their countries, as far as Ormus.Hong Bao's name appears in the made by Zheng He in Liujiagang in 1431, before his fleet left China on its 7th (and last) voyage to the "Western Ocean" (Indian Ocean).According to the inscription,
the two Principal Envoys (正使) sent by the Xuande Emperor to the countries of the Western Ocean were the eunuchs Zheng He and Wang Jinghong.