To look at the ships of the Song Dynasty, you should mainly look at Quanzhou. Quanzhou had a municipal shipping department in charge of foreign trade and was the largest port in the world at that time. "Quanlang, that is, a Yihu in this state, is also called a yacht... He lives scattered in the mountains and seas, and there are still many kinds of them today. They often live on boats, and they are also attached to the shore of the Luhai Sea. They can move with them at any time. The boat style has a high nose and a pointed tail. It was flat and broad, and was fearless in breaking through adverse waves. It was named Liaozhou."
The Song Dynasty built the "Shenzhou" for its mission to Korea, with a carrying capacity of more than 1,500 tons.
"Ibn Badutah's Travels" said that many Chinese merchant ships were sighted in the Indian Ocean. Chinese ships are divided into three classes, the larger one is called "Junk", the middle class one is called "Zao", and the third class ship is called "Kekam". The large ships have four floors and are fully equipped. "Each large ship serves a thousand people," carrying 600 sailors and 400 soldiers. Large ships have three to twelve sails, and the sails are all made of bamboo as a horizontal frame, forming a mat shape. There are also three small boats (firewood boats) attached to it, following behind, named "Half", "Third" and "Quarter" according to their sizes. "Such a huge ship was built in Zaitun, China, or in Guangzhou (Sinkalnan)."
The scale recorded in "The Travels of Ibn Baduda" The quantity may be slightly exaggerated, but it cannot be completely dismissed. As he said, boats are divided into three classes, equivalent to "Zhou Zeng" ("Zhou Zeng" combined into one character), "艚", and "Zhou Ju" ("Zhou Ju" combined into one character), which are all Quanzhou dialect names. This is still the case today.
It can be seen that the ships of the Song Dynasty were mostly called "zhou", "zhouzeng", "牚", "zhouju", etc., which were the general names of the ships and did not form a unique title, so they were not used in the Leave records in history.