现代英语的明显发展趋势之一就是前置修饰现象 ,包括名词作前置修饰语的使用越来越普遍。这种结构看似简单 ,实际上它是英语语法学习的难点。本文从efficiencyexpert出发 ,分析了名词作前置修饰语的各种表示法 ,分析了作修饰语的名词与中心词之间的语义关系 ,也分析了这种结构与名词所有格、与形容词作定语之间的区别 One of the obvious trends in modern English is the premodification, which includes the use of nouns as premodifiers. This structure seems simple, in fact it is difficult to learn English grammar. Starting from efficiencyexpert, this paper analyzes the various representations of nouns as prepositional modifiers, analyzes the semantic relations between nouns and central words of modifiers, and analyzes the structure and the lattice of nouns as well as the attributives of adjectives difference between