Preface and postscript: In preface and postscript besides indicate appellation of the age of home of painting and calligraphy, native place, time that make a picture, place, person that get a picture, renown extra, still have article or poetic word. These preface and postscript, do not be aimed at the content of the picture completely certainly, involve astronomy, geographical, human affairs extensively however, when year old, all sorts of content such as climate and other natural phenomena of a season, custom, products, landscape, history, philosophic theory. The in inscribing a picture already namely idea that bookman painter promotes also inscribes the meaning outside giving a picture, include the painter's feeling, mood, imagination and case of the course that make a picture, right the result experience of picture history, picture talking, brushwork, and all sorts of life fun, information. Preface and postscript if him home of painting and calligraphy is inscribed, call him preface and postscript, other place is made, call other preface and postscript. Return cent to be an author at the same time coetaneous person preface and postscript, or later generations preface and postscript. Later generations preface and postscript often is the content of a few textual research, also have of course pure view and admire a gender.
Study content of preface and postscript draws noumenal true bogus to have greater help to testimonial:
 1. If the place in preface and postscript is narrated, and this in home of painting and calligraphy or preface and postscript person him achievement, days have discrepancy, can be doubtful point. Be like the content in preface and postscript and be totally unrelated of itself of painting and calligraphy, what perhaps record poetic word implied meaning to wait for the later generations work that is this preface and postscript, be pseudograph apparently.
 2. When should be opposite to the true bogus of painting and calligraphy has doubt and cannot be judged from its itself, if there is preface and postscript on painting and calligraphy, try to preface and postscript textual research, differentiate in order to aid.
 3. If original text version is textual research article, can serve as reference.

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