目的字群结构是汉字书写动作系统中高频率书写词汇而形成的特殊单字整体结构。其书写动作的习惯特性不同于单字书写动作系统，具有超出单字书写动作习惯的特性和特殊表现形式。因此对字群结构及其特征的研究有利于完善笔迹鉴定的特征体系，尤其是对签名字迹和具有职业习惯者书写的少量字迹的同一认定有一定价值。

Word-group structure is the special structure of a whole word composed by high-frequency words in writing movement system．The writing habits of word-group that exist special characteristics that beyond the single word's characteristics of writing habits are different from single word's writing movement system．Therefore，the research on word-group and its charac— teristics are propitious to the perfection of handwriting examination characteristic system，especially for the identification of signa— ture and a few quantities of handwritings written by the person with occupational habits．