It depends. If strict format is required when answering official documents and writing in a specific style, "uppercase" writing is not required at other times.

Font format of the paper:

Title: Xiao Biao Song No.3;

The title1:No.4 is bold;

Title (1): Primary Four Regular Script;

Title (1): Level 4 bold;

Text: Xiaosi Songti;

Line spacing: fixed value 18.

Related information:

A paper generally consists of title, author, table of contents, abstract, key words, text, references and appendices, some of which (such as appendices) are dispensable. The composition order of the paper is: title, author, abstract, keywords, English title, English abstract, English keywords, text, references, appendix and thanks.