1. First, make sure the cover is really missing. The cover is placed on the last page of the journal, or misplaced in other journals. Therefore, you can check all parts of the log to see if there are any omissions.

2. Talking about SCI journals will provide official website's journal cover downloads, which can be found and downloaded in official website.

3. You can contact the periodical publishing house or editorial department by email or telephone to consult about providing electronic or paper covers.

4. Finally, through search engines or academic forums, find the cover of journals shared by others, or communicate with peers for help.