《九势》为书史要文,其真伪历来颇有争议。本文通过对其来源文献的分析,确定了《九势》出现不早于唐。对其中个别字句及书法技巧的分析,进一步确定其成型于宋,且可能利用了唐以来的资料拼凑而成。文中争议较大的“惟笔软则奇怪生焉”的原始含义当为:毛笔过软会出现丑怪的线条。对该句误解的原因是由于后人忽视了语境的变化而出现诠释偏差,而这种诠释偏差存在的意义和价值又是值得肯定的,这体现了经典诠释的多元性。 “Nine potential” for the history of the book, its authenticity has always been quite controversial. Through the analysis of its source documents, this article confirms that the “nine potential” appears not earlier than Tang. The analysis of individual words and calligraphy skills further determines their formation in the Song Dynasty and may make use of the data from the Tang Dynasty to create a patchwork. The controversial text in the “” but the pen is strange strange raw Yan "the original meaning should be: brush too soft will appear ugly lines. The reason for the misunderstanding of this sentence is that the descendants ignore the change of context and appear the deviation of interpretation. And the meaning and value of the existence of such deviation of interpretation are worthy of recognition, which reflects the pluralism of the classical interpretation.