笔迹鉴定的神秘性,挡住许多学者的路。笔者在研读了笔迹鉴定学之后,破除了这一专业工作的神秘性。本文将甲午战争北洋舰队最后投降时的四封降书,选取其中共用的关键字和关键词,进行了一一的比对。结果发现,这四封降书均出自一人之手,证实了丁汝昌并未写过降书,从而摘掉了长期以来强加在丁汝昌头上的帽子。 The mystery of handwriting identification, blocking the way many scholars. The author studied the handwriting identification, breaking the mystery of this professional work. In this paper, the four surrenders of the Beiyang Fleet during the last surrender of the Sino-Japanese War were selected and their common key words and keywords were selected for comparison. The results showed that all four books were from one hand, confirming that Ding Ruchang did not write down the book, thus removing the long imposed on Ding Ruchang head hat.