《神龙本兰亭序》是目前公认的兰亭墨迹善本,研究颇多,但对其卷后“永阳清叟”题跋的作者始终没有考证出来。该文将题跋内容、印记与文献资料相对照,揭示出此跋作者为宋元之际以古学闻名的儒学之士郑滁孙,其书写时间为元世祖至元三十一年三月三日,书风恣肆而略见颓唐。此跋当为郑滁孙传世书迹孤本。 “Shenlong Ben Lanting Preface” is currently recognized Lanting ink rare, a lot of research, but after the volume “Yong Yang Qing” Postscript author has never been verified. This article contrasts the inscriptions with the literature materials, revealing that this author is Zheng Chu-sun, a famous Confucianist who was famous for the ancient Song and Yuan dynasties. The writing time was from March 31 to March 31, Unobtrusive book style and slightly decadent. This postscript as Zheng Chu Sun Chuanzhi solitary book.