Modular multilevel matrix converter (M3C) is a special member of the modular multilevel converter (MMC) family. M3C implements matrix topology using MMC technique. Owing to this characteristic, it has many advantages in low frequency power conversion and high-power motor driving occasions. However, M3C also inherits a few unfavorable features from matrix converter, in which, sophisticated modulation is the most undesirable one. For solving this issue, this paper proposes a bipartite graph masking modulation method based on phase voltage vector which considerably reduce the complexity of M3C modulation. Moreover, a time-based simulation is created and the results verify the proposed scheme which has excellent static and dynamic characteristics.