The thirty volumes of Yeke Series, edited and engraved in Jiajing period, Ming Dynasty, and now collected in Northwest Normal University Library was selected as one of the second national precious ancient books because the book was once collected by Pan Zuyin and Pan Jingzheng and the latter wrote a postscript with handwriting. Pan's postscript is a good help to understand the value of the book. This is the meaning of the postscript and also the significance of this book.