Abstract: The history book Renwu Pinghai Ji collected by the Library of Congress of the United States,is of great value to the study of the history of the late Ming Dynasty, ocean history and local history of Shanghai. However, after investigation, this book is incomplete. Not only the content of the text is incomplete, but also the lack of preface and woodblock print Pinghai Tu. Pinghai Tu is now kept in private collector in China. It is suggested that Pinghai Ji and Pinghai Tu should be published together in the future to maximize the important historical value contained therein.