Liancheng sibao is one of the four famous bases of wood block for printing during ming and qing dynasty . it had published more than one thousand kinds of books such as " kangxi an emperor of qing dynasty dictionary " and " jingping mei a plum in a golden bottle " . sibao had played an important role in chinese printing history 连城四堡是我国明清两代著名的四大雕版印刷基地之一，出版过康熙字典金瓶梅等一千余种书籍，在中国印刷史上占有重要地位。
The writer has been told not merely once by prot . dai nanhai t hat the study of chinese photoxylographical printing is a very hard n ut to crack in the study of the edition of anciant chinese books . wh en was it invented ? as opinions always vary on foreign and chinese aca demic circles ， no unanimous conclusion can be drawn . judged by material ， technological ， and written languags conditions essential to its invention ， it was probably invonted in late sui or northern and southern dynas ties ， but to say it invented in eastern han is absolately impossible 戴南海教授不止一次的给我说:中国雕版印刷术是研究中国古籍版本学的一道大难题。究竟发明于何时，中外学界历来众说纷云，莫衷一是。从印刷术发明的必须具备的物质条件、技术条件和文字条件来衡量，也许在隋或南北朝晚期。
