This paper suggests that the phase Inheritance-based account can provide a unified explanation for both the A- and A’-movement of English DOCs. The main hypotheses adopted in this paper are: 1) Every functional head bears a generalized EPP feature, while the phasal head is equipped with both a generalized EPP and a Phase EPP feature; 2) Passive v is also a phasal head; 3) The phasehood of v/v* can be handed over to the applicative head; 4) Mixed Chains Constraint must be respected. According to the phase inheritance-based account, only the indirect object is allowed to be passivized and only the direct object is allowed to undergo WH-movement, otherwise Mixed Chains Constraint will be violated. By assuming that the phase EPP on the little v can be retained or handed over to the applicative head in different languages, this analysis also sheds light on the A- and A’-movement of DOCs from the cross-linguistic perspective. (Guangdong University of Foreign Studies; Guilin University of Electronic Technology · Guangdong University of Foreign Studies)