Abstract: Documented evidences are an essential part of The Grand Chinese Dictionary, which has been the focus of study for nearly twenty years. However, the modern documented evidences failed to be given enough concerns.There are 182 cases of documented evidence from Besieged City in The Grand Chinese Dictionary. There are seven kinds of errors: source, writing, punctuation mark, order, isolated evidence, quotations-lagging, unified edition. The proportion of errors is high, and the types can comprehensively reflect the problems about the modern documented evidences in The Grand Chinese Dictionary. The errors of modern documented evidence affect the normalization of The Grand Chinese Dictionary, confusing the recognition concerning the origin of words and their evolution. The common problems and lack of their awareness make it all the more important and urgent to revise the the modern documented evidences in The Grand Chinese Dictionary.