Legal analysis: It depends on the specific situation. Generally speaking, it is not illegal. This is against academic norms, but it is not illegal. According to Article 578 of China's Civil Law, if one party explicitly expresses or shows by his own behavior that he will not perform the contractual obligations, the other party may require him to bear the liability for breach of contract before the expiration of the performance period.

When a periodical paper is published, duplicate checking must be mentioned. Only when Chechong has passed the qualification requirements of the magazine can the next review be carried out, otherwise the magazine may consider the paper plagiarized.