In fact, the special issue of SCI journals is the same as that of domestic academic journals. A special issue is a publication aimed at a certain topic or published on a specific date or anniversary. The information in the special issue is the same as that in the general issue, such as the serial number. Some special issues are published regularly or irregularly, some will occupy a certain issue of the periodical, and some will be added separately.

The retrieval of SCI papers is the key. Whether the special issue will be retrieved depends on the specific situation. Generally speaking, the retrieval situation of special issues is more optimistic than that of supplements. When the special issue is retrieved, it has the symbol of SI. So can the special issue be used to publish the topic of the paper? There are different requirements for specialized issues in the evaluation of professional titles. Some titles approve the publication of special issues, while others do not. If it is explicitly required in the professional title literature that SCI periodicals must be published, then special issues are not optional. If there is no clear restriction, the special issue will also be found, and it is not unreasonable to publish the SCI special issue.

In short, the publication of special issues is not 100% recognized as regular publication. Therefore, the author needs to consider many aspects when weighing whether to issue a special issue, and then make a choice after understanding the specific requirements.