The Ming Dynasty was the third peak in the history of shipbuilding in China, and Zheng He's treasure ship best reflected the technical level and ability of shipbuilding in the Ming Dynasty. Dabao is about150m long and 60m wide. It is speculated that the number of ships that Zheng He went abroad each time should be more than 100, including 40 to 60 large treasure ships, as well as horse ships, grain ships, small boats, warships and other auxiliary ships. Shipbuilding in Ming Dynasty was not only large in quantity and scale, but also varied in types. There are transport ships, seagoing ships, warships and so on. There are many kinds of boats, besides sand boats and lucky boats, there are also wide boats and bird boats.