The topics of the thesis on the history of navigation can be the influence of Qin unification on China's navigation activities, how the Western Han Dynasty opened up the Maritime Silk Road, and the maritime relations with Japan during the Sui and Tang Dynasties. Speaking of China's maritime activities, firstly, the land passage was blocked by the Ottoman Empire in the Song Dynasty, and then the maritime trade route was opened, which is the so-called Maritime Silk Road. In addition, Zheng He went to the Western Ocean in the Ming Dynasty. Zheng He is the originator of the history of world navigation. All the above topics can be written, and there are many materials on the internet for reference.