The technique of printing business has evolved dramatically, from manual copies to engraved printing. With the emergence of engraving, the written copies, which were laboriously made, are replaced by printing copies. The advantage of the printing copy is fourfold: easy to produce, difficult to eliminate, cost effective, and convenient for collection. A plethora of copies can be printed effortlessly and circulate widely. As such, the engraving in the Sung Dynasty shoulders specific obligations and tasks which include as follows: first, since the Sung Dynasty regards highly of arts and the humanities, the royal government will give he printed books to courtiers or foreign delegates as presents or tokens of hospitality, and wishes to widen the dissemination of knowledge by so doing. Second, regarding t the engraved books in non-governmental circles, they are printed depending on public demand for commercial and financial considerations. The goal is to increase the circulation of books. Moreover, the literary canons and the annals of history are for self-reflection and practical guidance. Also, strict censorship of books that concern taboo subjects is introduced--for fear of spreading the banned books to the public. However, such imposition only widens the circulation of those banned books, and makes the books more precious to scholars. By demonstrating communication theories such as media control and the effects of media, the paper tries to apply them to the interpretation of the political and pedagogic policies of engraving in the Sung Dynasty. Given that the number of engraved book, the scale of circulation, and the exquisiteness of the woodblock has all reached their apex due to the smooth combination of governmental policies and the engraved books, The Sung Dynasty may be termed as the apogee of engraving.