The types of contrastive focus structures in ancient Chinese coordinate complex sentences can be divided according to the syntactic units in which the focus is realized,mainly in-to clause-based focus structures and constituent-based focus structures.Among them,clause-based focus structures are the most dominant type.Constituent-based focus structures are realized through focus marking words and symmetrical patterns.From the perspective of the number of fo-cuses,the types of coordinate complex sentences can be divided into single-focus structures,dou-ble-focus structures,and multiple-focus structures.The evolution of focus structures in ancient Chinese coordinate complex sentences has the following characteristics:the proportion of constitu-ent-based focus structures has slightly increased;the number of focuses within complex sentences has evolved from single-focus structures to double-focus or multiple-focus structures;and the real-ization of focuses has become more diverse.The main motivations for this evolution are semantic harmony,syntactic impetus and pragmatic reinforcement.