Qu Dajun's important long article on foreign seagoing vessels titled"Yangbo"re-corded the Western ships sailing to China during the Ming and Qing Dynasties.It can be divided into two parts.The first part records the technology of Western ships,based on the sections"Yang-fang(foreign seagoing vessels)"and"Yang Chuanding(nails of foreign ships)"in Volume 5 of Wuli Xiaoshi(Basic Understanding of the Laws of Nature)by Fang Yizhi,who was a close friend of Qu Dajun.The second part focuses on historical events related to Western ships,referring to the long poems written by Gao Zhao in the early years of Kangxi period of Qing dynasty,including He-lan Shibo Ge(Poem about the Nederland's Diplomatic Ship)and Hongmao Xing(The Visit by the Europeans).Qu Dajun revised and integrated all the above-mentioned materials in the article"Yangbo".However,the records contain lots of inaccuracies and inconsistencies.These errors have hindered subsequent research and understanding of Western maritime technology,and there-fore should be analyzed and corrected.