This paper briefly introduces the use norms and precautions of references with sequential coding system.

According to the order in which the documents first appeared, they are coded continuously with Arabic numerals, the serial numbers are enclosed in square brackets, and the form of the above target is placed at the end of the sentence (after the name or before the period). If the same document is cited for many times, the number shall be subject to the number when it first appears. The quoted page number is outside the square brackets.

Sequential coding system. The description format of most cited documents in China adopts sequential coding system. The sequential coding system is continuous coding according to the order in which the documents (including figures, tables and their descriptions) cited in the text of the paper first appear, and the serial numbers of the reference documents are represented by Arabic numerals.

The quotation in this paper is to mark the serial number after the sentence corresponding to the relevant phrase or paragraph, put it in the square brackets in the upper right corner in the form of a superscript, and write the quotation to the author, and mark the serial number in the upper right corner of the author, such as [1]; If the author's name is not written, the serial number should be placed after the quotation. Pay attention to separate two or more discontinuous serial numbers with commas when writing, such as [1, 5], [1, 3,7]; If there are more than three consecutive serial numbers, only the serial numbers of the cited documents shall be marked, and the middle shall be connected end to end, such as [1-5].