1. Check the periodic submission system. Many journals use online submission system, through which you can log in your account and check the review status of papers.
2. Ask the editorial department by email. If you can't find the status of your paper in the periodical submission system, you can write to the editorial department to remind you euphemistically.
3. Use third-party tools to make inquiries. For example, Elsevier will send a link to each author's email to check the status of the manuscript. Open this link, you can see how many reviewers have been invited and how many reviewers have agreed to review the manuscript.