Constructionalization mainly focuses on the emergence, development and change of constructions in diachronic dimension. It has developed into a new approach in Diachronic Construction Grammar and achieved fruitful achievement in recent years. However, these achievement remain to be further discussed about how important they are for constructional acquisition. This paper attempts to elaborate the essential ideas of constructionalization. It is proposed that these ideas bring about an important revelation for constructional acquisition and provide a new perspective for constructionalization which is regarded as complex cognitive adaptive system.