文字书写习惯的特性包括反映性、同一性、特殊性、相对性、可变性等。由于作案的形式和手段不同,文件物证在现场的存在方式和形态也不一样,提取、固定的方法也有很的大差别。本文对现场文件物证的提取方法及如何收集比对样本进行了较为深入的探讨。 The characteristics of writing habits include the reflection, identity, specificity, relativity, variability and so on. Due to the different forms and means of committing crimes, the ways and forms of the existence of documentary evidences on the scene are not the same. The methods of extracting and fixing are also quite different. In this paper, on-site documentary evidence extraction methods and how to collect the comparison sample conducted a more in-depth discussion.