SCI papers are recognized by international academic circles as the most valuable academic papers. Therefore, SCI publications are very strict in reviewing articles, and most of them are three reviews and three schools. External review is the most rigorous review link, which is completed by top experts and scholars in the industry. The time for experts to review papers is uncertain, which is beyond the control of magazines and authors.

There will be 12 states in the whole process of SCI papers, among which only one state will be displayed during the review process, that is, Underreview, which is a long wait. This process may be the most time-consuming step in the whole release process, which usually takes 1-2 months.

SCI is a citation database established on 1957 by EugeneGarfield of institute for scientific information, Philadelphia, USA. SCI (Science Citation Index), EI (Engineering Index) and ISTP (Science and Technology Conference Index) are three world-famous retrieval systems for scientific documents, which are internationally recognized as the main retrieval tools for scientific statistics and scientific evaluation. In February 2020, the Ministry of Education and the Ministry of Science and Technology issued "Several Opinions on Standardizing the Use of Relevant Indicators of SCI Papers in Colleges and Universities and Establishing Correct Evaluation Orientation". This document should break the "SCI supremacy" of papers, take this as a breakthrough, take practical measures with strong pertinence and operability, break the "paper-only theory" and establish a correct evaluation orientation.