Abstract: Combining the characteristics of reverse internationalization enterprises, and deconstruction of the innovation search strategy from two dimensions (network embeddedness and knowledge source utilization), this paper explores the different influences of two balanced innovation search modes (home-focuesd and foreign-multi search, home-multi and foreign-focused search) on organizational ambidexterity through strategic fit theory, and the moderating effects of decision rationality (causation and effectuation). In this paper，the multiple regression method is used to test the data of 245 enterprises. It is found that: (1)both of the two balanced innovation search modes promote organizational ambidexterity; (2)causation and effectuation have weakening effects on the positive relationship between the home and abroad cross-search balance and organizational ambidexterity; (3)the integration of causation and effectuation has a positive moderating effect on the relationship between |HM-AF| and organizational ambidexterity, but only positively strengthes the effects between |HF-AM| and integration level of ambidexterity. This research further deepens the understanding of the mechanism of innovation search balance on organizational ambidexterity based on decision rationality theory, and provides a new way of thinking for the innovation practice of reverse internationalization enterprises.