He arrived in Tainan on February 25, 1697, and stayed there for over two months, buying tools for sulfur mining and refining.
Although Yu traveled in a hurry, he still recorded many Indigenous tribes in Taiwan at the end of the 17th century.
[2] Historian Yang He-chih (楊龢之) believes that Small Sea Travel Diaries provides modern people with an imagination of the world in 1697, when most of the land was still untouched by agricultural society, except for the areas near Tainan.
[3] Huang Wen-te (黃文德), an editor of the National Central Library, believes that Yu Yung-ho's observations on Taiwan's nature, culture, history, and the ethical thinking of intellectuals make Small Sea Travel Diaries a unique work.
The book was different from the works of traditional Chinese literati, who blindly despised the Indigenous people or treated the tribes and their unique customs, which were different from Han culture, as subjects of "curious hunting”.