According to DC voltage of cascade D-STATCOM affected by many facts and hard to control, a hierarchical coordinated control strategy of DC voltage is proposed in this paper. In order to make DC voltage more stable and controllable, stability control, phase control and balancing control are used separately for DC voltage total stability, phase-to-phase balance and modular balance. The simulation of PSCAD/EMTDC model under load change and unbalance load verifies the feasibility and effectiveness of the proposed strategy.