Tap Search. If it is a regular periodical can show its domestic uniform number (CN number), show the domestic uniform number (CN number) is illegal publications. 2, the postal code ask whether the publication has a postal code, regular periodicals can be subscribed by postal code through the post office. Illegal periodicals are generally not issued in the post office, there is no postal code. The format of the postal code is XX (1 or 2 digits) - XXX (3 digits). However, it should be noted that legitimate journals may not be distributed through post offices. So this point can only be a reference. 3, distinguish between supplement, special issue and the difference between the main issue of the magazine. From the name of the publication can be judged, the title of the journal only one, and this name according to the "query number authenticity" method can be queried to its domestic uniform number. The name of the journal is mostly "XX" magazine "teaching and research edition" or "academic edition" or "theoretical edition" or "XX-XX" magazine or "XX-XX", this kind of a certain magazine, a certain edition or the name of the journal with a dash or the name of the journal with a dot are all supplemented or special issue. According to the method of "checking the authenticity of the journal number", the query is not due to the domestic unified journal number.4, you can also check CNKI (China Knowledge Network) or Wanfang database. Except for a few legitimate journals that have not been selected in the database, most of them have been selected. In summary, the most authoritative and reliable way to judge is: access to the official website of the General Administration of Press and Publication of the State, in the "news organization" query column enter the name of the journal, can find the CN number is a legitimate journal, otherwise it is an illegal publication of newspapers and magazines on the occasion of the anniversary of the need for some kind of increase in the length of the booklet or another. According to the provisions of the General Administration of Press and Publication, each legal periodical can publish two supplements in a year, and the articles of supplements are not included in the China Periodicals Network (now there are a few periodicals whose supplements are included in the Periodicals Network), and supplements are compared with the regular periodicals, although they are not illegal, but they are far inferior to the regular periodicals in terms of quality. Therefore, supplements are not recognized in many places, especially in schools, institutions and so on when assessing titles. To put it bluntly, the supplement is to increase the income of the editorial department, because the supplement is openly charged. In recent years, academic journals, supplements and special issues do not count points, some of the editorial department out of supplements and special issues, it is deliberately written on the cover of the xx issue, the theory of special issues, academic special issues such as this word, do not indicate or in the extremely easy to find the place to indicate that the "Supplement" "special issue! "words to confuse the authors and readers, and even the contents of the addendum also on the journal network, so more confusing, so the author in the publication of the article before, must find out is not an addendum. Not on the knowledge network of the supplement, as long as to know the online search, understand is not a genuine journal. If the supplement is on the website, it will be indicated on the website as "Z1", "Z2" or "S1", "S2". It is also clear at a glance. Now the education system, more and more attention to know the net, such as the Hebei side, do not know the publication, are not counted points.