(1) created a large-scale collating text, sorted out the content and content order of ancient books, and finally wrote a final example.
There are more than13,000 books recorded by Liu and his son, and the number of books they read far exceeds this number.
(2) Creating an excellent method of sorting out documents.
There are three items that future generations especially admire. One is the extensive accumulation of books; The second is to preserve heresy. If there are different records or doubts about what the ancients recorded, but the evidence is not enough to be used as a conclusion, he will not delete it casually, but save it as a heresy.
The third is to create an example of writing a preface. Refers to the content summary or bibliographic problem solving, including book title, circulation, author's life, main contents, etc. It is very useful for readers to understand the content, characteristics and circulation of this book briefly before reading the whole book. This is indeed a pioneering work.
(3) Liu and his son have outstanding performances in chapter identification and mirror research, and have developed the concept of academic classification.
Liu and his son also examined the academic origin from the perspective of historical and cultural development, got rid of the domination of theological views, and had a tendency to progress.