You go to the library home page and click on the feature data.
Just go to this webpage /tsdata/default.aspx,
Click on the "Catalogue of Chinese Core Journals" at the lower right to find the names of core journals. After clicking, there can be a table of contents on the left, select categories such as "natural science" and "industrial technology", and then click to find the names of core journals related to this category.
After you find the name of the core journal, click "Electronic Resources" at the top, click "Remote Package Library of CNKI Platform" at the bottom, and then there is a triangle symbol in "Search Item". Select "source" and "search term", enter the name of the core journal you found, and then click "cross-database search" to be OK.
Another way is to enter "CNKI Remote" directly from the bottom of the library homepage, and there is a "Journal Navigation" on the left side of the CNKI homepage. Click in and select "Core Journals", and many categories will appear. You can select the core journals you want to check, and then you should know how to proceed.
All right, that's all.