With the increment of level, there is a large amount of the computation for the controller of MMC-HVDC system. To speed up, according to the equivalent circuit of MMC converter, this paper designs the controller of MMC-HVDC system based on the three-phase static coordinate system. The controller combines deadbeat current control with nearest level modulation (NLM), and improves the sampling selection method of current reference value for the precision. The proposed controller realizes decoupling control with fast dynamic response and high precision, decreases the amount of system computation with less PI regulator and coordinate transformation. The MMC-HVDC simulation model is established in PSCAD/EMTDC environment and the simulation results verify the validity of proposed controller.