CSCD is the abbreviation of Chinese science citation database sponsored by the National Library of China Academy of Sciences. A new version of 20 13-20 14 was released this year. DOI is the ID number of the paper, and a DOI number corresponds to an article, which has nothing to do with CSCD. Whether it is included or not, first of all, the journals that publish articles must be the source journals of CSCD, which can be found on the homepage of China Science Citation Database. There are two ways to check whether an article has been included. The first is to make inquiries in the library with novelty retrieval station. The second is to enter the database of the place where you bought the database (such as a better university library). As for the collection number you mentioned, I just checked the CSCD database and didn't see any collection number. If the article can be found in the database, it is included; if it cannot be found, it is not included. It's that simple. If you need a certificate of inclusion, then only the novelty retrieval station can get it out.