The requirement for doctoral sci papers is about 1-3. Sci thesis is a general requirement for doctoral graduation. How many papers to publish, when to publish, whether to publish or be searched, etc. , will vary from school to school. There are many schools where doctors study, and each school has corresponding regulations for doctoral papers. As for the number of published sci papers, some are more than others, and even different disciplines in the same school have different requirements for the number of articles. For example: 1, Basic Requirements of Mathematics (Statistics) of Beihang University (1) (meeting one of the following two conditions): ① publishing 2 papers in SCIE source journals; ②SCIE published 1 paper, and 2 papers were published in EI and MEDLINE or China Science (Chinese version), Journal of Mathematics, Journal of Applied Mathematics, Computational Mathematics or System Science and Mathematics. (2) Exemption from blind review: the source journals (Q 1 region or Q2 region in the partition table) in this discipline published papers 1 article. 2. Basic requirements for the discipline of Materials Science and Engineering and Chemistry (1) of Beihang University: publish 3 papers in SCIE source journals, with cumulative impact factor above 3.0, and at least publish papers with impact factor above 1 0/in foreign journals.