The extended edition of the source journals of the China Institute of Science and Technology Information (CCSCI) was an extended edition of a group of CCSCI source journals published by the China Institute of Science and Technology Information (CCSCI), which included all the journals included in the CCSCI. These journals were usually important journals in the field of academic research with high academic reputation and influence. The extended edition of the source journal of the CSCI was a core journal with high authority and academic value. It had a high reputation and influence in the academic community and society. However, it should be noted that the evaluation criteria and content of core journals would vary from institution to institution, from discipline to discipline, and from era to era. Therefore, not all extended versions of the source journals of the CSSSCI were core journals.