1. Journals are single-blind. Some researchers may have noticed that some journals are single-blind and some are double-blind. The so-called single blind peer review means that anonymous peer reviewers know the author's name and unit. Double-blind review means that the papers seen by anonymous reviewers are also anonymous, that is, neither party knows who it is. 3. Single blindness is biased by single blindness, and double blindness is concerned. Because the shortcomings of double-blind review are more hidden and uncontrollable, they are questioned more. In order to improve the peer review mechanism, many journals use various methods to avoid interested reviewers and authors from meeting. In that case, maybe we can consider open peer review. In other words, the author and reviewer of the paper both know each other's name and organization, and they have no interest relationship.