In the age of omni-channel or multi-channel marketing, cross-channel integration has become a hot topic and new research field. However, little has been done on the review and elaboration of relevant studies, and the problems such as superficial understanding of cross-channel integration, inconsistency in the measurement of cross-channel integration and lack of theoretical guidance, which is a big problem for follow-up studies. In view of this, on the basis of the elaboration on previous studies, this paper reviews the literature of cross-channel integration, discusses the connotation, dimension and measurement of cross-channel integration, constructs a theoretical framework for cross-channel integration according to the antecedences, direct consequences and firm performance, and identifies some research gaps. This will benefit the future research on the topic.