Firstly, this paper analyses the control strategies adopted by MMC in shutdown procedure and makes the energy saved in the capacitors feed back to grid as far as possible after considering the redundant sub-modules in each arm. Secondly, to choose the discharge resistance more reasonable, this paper deduces some formulas again to guide how to choose the system parameters and calculates the time of fast shutdown strategy. Therefore, a novel shutdown strategy with using discharge resistance more reasonable as far as possible to reduce shutdown time and enhance economy of MMC system is put forward . Finally, a shutdown simulation model of MMC is constructed in MATLAB, which has more superiority over other references published before.