The book ＜Floating Sea Record＞, written by Korean litterateur Zhang Hanzhe, who lived in 18th century, described a breathtaking experience across the ocean by himself and the others. This book has important value of historical cognition and can help people to understand the history. According to the book of records, we can rediscover a diplomatic matter in Korean history, explore the place where part of Chinese and Korea migrated when Qing Dynasty replaced Ming Dynasty. According to the book, we also can knew the Korea people`s different attitudes to China and Japan and other East Asian countries, and the writer`s understanding of Korean ordinary people. From this book, we can see the advanced shipbuilding technology in the East Asia at that time. This book has different value and functions, we should study it deeply from different aspects.