Does the subject want to ask, "Can I be a reviewer without sending a paper?" Yes Publishing high-quality papers is the most direct way to be a reviewer. Unpublished papers can become reviewers in other ways, and they can be reviewers. As a review representative, he is considered as a domain expert. For novice researchers, resume and reputation can be added points, which is also a symbol of further research career. In addition, reviewers also have the opportunity to understand the latest development in this field and broaden their knowledge.