I. Binding
Whether the design scheme is in accordance with the intention of the book.

II. Layout 
For book printers in china, there have 4 points you need to concern when you do the layout.
(1) Whether the opening, center and picture dimensions of the book are coordinated; whether the design style runs through the whole book, including whether the title page and appendix layout is easy to read, and whether it is appropriate to the content of the book (specific to the size, line spacing, the relationship between the president, left and right sides neat or only left neat, etc.).
(2) Whether the font is appropriate to the content and style of the book.

(3) How the design is being implemented (whether text-to-picture relationships, notes and footnotes are easy to find).
(4) Whether the layout of the page is clear, appropriate and in line with the purpose (striking text, appropriate mix of different fonts, arrangement of title/page/brow, etc.).

III. Artwork design
(1) whether the dust cover design and cover design conform to the contents and requirements of the book, and whether there are any design on the spine of the book.
 (2) Whether the dust cover design and cover design are combined in the overall scheme (e.g. text, colour). 
(3) Whether the material chosen for the cover is reasonable. Book printers in china will give you some recommendation if you are not sure about the material.
(4) Whether the cover design is suitable for the technical requirements of book binding (e.g. the connection between the cover and the spine of the book, the creases of the paperback book and the grooves of the hardcover book, etc.).
(5) Whether the pictures (photographs, illustrations, technical illustrations, decorations, etc.) are combined in the basic scheme and whether they meet the requirements of the book and are selected.
(6) Technology: whether the layout is balanced (whether the spacing is too wide or too narrow). book printers in china will check the artwork clearly before printing.
(7) Layout: whether the quality of the layout of the index, table and formula of the catalogue is proportional to the three-dimensional part, whether the word spacing is appropriate to the size of the word and the style of the word (in the text font, title font and title font, punctuation and other specialized symbols); whether the word spacing is evenly separated; and whether the broken line of the title conforms to the meaning of the text. Whether the boldness of the font is appropriate to the style of the font; whether the word line is wise; whether there is too much. Only the left neat layout, the right is harmonious.
(8) Spelling: consistency and consistency in the spelling; consistency in the spacing of titles, chapters, paragraphs, pictures, etc.; avoidance of punctuation at the end of a sentence at the first word in the first line of the page.