Abstract: The traditional legal-words(affix) are basic lexical words in the legal term system, which are stabile,productive and inherited. With the development of society, these lexical words may be changed in various aspects, that is, both the forms and meanings are reserved, or forms are reserved but meanings changed incompletely, or forms are reserved but meanings changed completely. Analyzing the evolution of these words (affix) could help us not only to use the legal terms accurately, but also to provide some references on the formation of new legal words.

Key words: traditional legal-word (affix), evolution, word meaning, word formation