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Zhangwu fault depression located in the south of Songliao Basin��is an Early Cretaceous fault basin in the extensional setting�� During the evolution of Zhangwu fault depression��various types of transfer structural accommodation systems have been formed in different parts of the extensional structure�� According to the transfer structure theory of extensional fault system��the authors think that the Zhangwu fault depression developed in transfer structures�� Through the research of the fault systems��the fault evolutions and the transition ways of displace- ment and their corresponding transfer structures among faults within each fault system and among the fault systems�� the transfer way as determined as relaying��the way of the transformation resulted in wedge- shaped fault steps�� At the same time��the transfer structure effected in a certain degree on topography��sedimentary system��hydrocarbon source rocks and reservoir of the basin�� The exploration practice of Zhangwu Oil field shows that the transfer struc- tures tend to develop lithological reservoir��