SCI/SCIE/SSCI的查询验证链接如下，直接搜索期刊名字（注意，一般是精确匹配，要完全写对名字）：

SCI查询：http://mjl.clarivate.com/cgi-bin/jrnlst/jlsearch.cgi?PC=K

SCIE查询：http://mjl.clarivate.com/cgi-bin/jrnlst/jlsearch.cgi?PC=D

SSCI查询：http://mjl.clarivate.com/cgi-bin/jrnlst/jlsearch.cgi?PC=SS

EI查询：https://www.engineeringvillage.com/search/quick.url

SCI索引（别名《科学引文索引》，英文全称是Science Citation Index）是美国科学情报研究所出版的一个世界著名的期刊文献检索工具。它收录全世界出版的数、理、化、农、林、医、生命科学、天文、地理、环境、材料、工程技术等自然科学各学科的核心期刊3700多种。通过其严格的选刊标准和评估程序来挑选刊源，使得SCI收录的文献能够全面覆盖全世界最重要和最有影响力的研究成果。

SCIE索引，英文全称是Science Citation Index-Expanded，称为扩展版。最早的SCI索引的期刊是以光盘版的形式，期刊数量较少。而SCIE是网络版，并且收录了8000多种期刊。过去大家比较重视二者的区别，最近几年开始淡化了。网上有传言说“SCIE期刊不是SCI期刊， 是SCI觉得它的水平接近SCI了，但是需要再考察考察。若果是真的高，则就会成为SCI”等，其实是不准确的。Thomson Reuters官方说法如下（来自StackExchange，但是未有引用）：

The Science Citation Index (SCI) is a sub-set of the Science Citation Index Expanded (SCIE), containing journals that rank competitively among the most highly-cited core journals in their category or categories. The Science Citation Index Expanded is essentially the web version of what used to be a database available only on CDRom/Diskette.

When selecting the journals for the Science Citation Index we choose the top journals from each subject category and supplement this with top regional journals from each category to give broad geographic and multidisciplinary coverage. The evaluation of and acceptance of a journal for the Science Citation Index Expanded or the Science Citation Index is essentially the same with one major difference.

This difference is in the application of citation analysis to the journal. While every science journal in our database is covered in the Science Citation Index Expanded and only those journals of relatively significantly higher citation impact are selected for the Science Citation Index. In other words, Science Citation Index covers only the most highly cited, highest impact journals in each category. This is because of the constraints of the CDROM and print media there is no difference in the selection process for Science Citation Index and Science Citation Index Expanded journals.