The Record of the Day is the masterpiece of Gu, a famous scholar and great thinker in the late Ming and early Qing Dynasties, which has a great influence on later generations. This book is a large-scale academic reading notes written over the years, and it is Gu's work of "recalling the past, reading notes and writing a book". It aims at Ming Dow and saving the world, including all the author's academic and political thoughts, and has the connotation of practical use.