1994年在美国北卡罗莱纳州出土一面铸有“大明宣德委”字样的铜牌,2006年面世,本文就出土发现经过,明代史文献背景,比较宣德炉与明代铜钱的书体和冶金学,金出土地历史地理等多方面,考证真伪,得出结论是该金牌非赝品。中国明代文化留在美洲的痕迹证明郑和船队曾到美洲的可能性极大。 In 1994, the bronze medal named “Daming Xuande Committee” was unearthed in North Carolina of the United States. It was published in 2006. This paper unearths the discovery of the bronze medal of Xuande Furnace and Ming Dynasty copper coins Learn, history and geography of gold unearthed in many aspects, textual research, concluded that the gold medal is not a fake. The traces of the culture of Ming Dynasty in the Americas that left Ming China proving that Zheng He flew to the Americas are highly probable.