Note: As long as it helps to explain the technical content, don't make a bunch of unimportant and complicated diagrams. Of course, we should also pay attention to discretion, because it is generally very, very difficult (unless it is a background map) to add drawings in subsequent procedures.
Specific instructions and drawings need you to refer to the documents provided by China National Intellectual Property Administration website, which are very detailed.
The appended drawings of the invention patent require:/SIPO 2008/ZSJZ/CJWT/200804/T20080402 _ 367735.html.
Requirements for drawings of the utility model (see paragraph 7.3 on page 56 of the document):
/sipo/zlsc/sczn 2006/word/ 1.2 . doc