Abstract: The research on the delexicalization of words is the hotspot in present grammatical study, with the directional verb being the most likely to delexicalize. This thesis systematically illustrated the foundation of Lai's grammaticalization pattern. It is divided into four parts. Part one makes a brief explanation on the question of grammaticalization. Part two detailed depicts the path of Lai's grammaticalization. Part three discusses the delexicalization of a few words which contain Lai. Finally, part four puts forward the realification of Lai.