Focus and topic are edge features.The focus in lian...dou/ye construction is syntactically located in CP and the lian...dou/ye construction is actually a topic construction with a focused constituent.The focus in the lian-S+dou/ye construction and lian-O+S+dou/ye construction is a focus topic which bears focus feature and topic feature simultaneously,although the focus in S+lian-O+dou/ye construction only possesses focus feature,the preceding subject contains a topic feature.In derivation,lian-focus is argued to move from IP to TopP or FocP within CP domain.It is claimed that the cartographic syntactic-based CP analysis in this paper provides a uniform account for the different types of lian-constructions,which accounts for the identification of the focused element when lian is covert.