Because of the data quality in the bibliography, the retrieval quality of the bibliography database has been reduced in China. This paper has raise the method of how to solve this problem in current data environment, that is to establish the “Multiple Thesaurus of Classification” with the retrieval language compatibility between the “Chinese Library Classification”, “Library of Chinese Academy of Sciences Classification”, “Chinese Library Subject-Classification” and “Classification and code disciplines”, and use this thesaurus in the bibliographic retrieval system to improve the efficiency.