The selection standard of source journal is very important for the Second Literature Database,which has effect on its quality and impaction.

The source journals and index system which can be divided into the basic indexes,applied indexes and qualitative assessment,are the core elements in journal assessment.

According to the statistical analysis on CSCD source journals,this paper expounds the differences of the periodicals of various subjects collected by CSCD and the causes of these differences,and points out the shortages of using CSCD database as a tool to make quantitative evaluation on periodicals,and further puts forward some methods for solving this problem.

According to the Information Architecture(IA)and Bibliometrics,this paper discusses an important role for academic evaluating by picking source journals of database,analyses the source journals of SCI,CSSCI and its influence on academic evaluating.