this paper analyzes the perception of the librarians in mainland china about the copyright during the development of digital libraries with hongkong (hk) and taiwan as the reference system, through questionnaire survey of copyright cases of the digital libraries by investigating the digital library builders and librarians of 30 universities from mainland china, hk and taiwan ranked among the top 500 in the academic ranking of world universities (sjtu version). the report holds that: 1) the copyright law shall evolve with the times and be revised from time to time; 2) it is imperative to popularize and educate in the copyright law; 3) the guidelines on the use of the copyright law of the education industry shall be developed as soon as possible; and 4) the regulations for collective management of copyright shall be enforced as early as possible.