How to expand the rough set model in incomplete information systems play a crucial role in the development of the
rough set theory. In this paper, by considering the perferenc-ordered domains of the attribtues, the expanded dominance
relation and the limited dominance relation are employed to construct multigranulation rough sets, respectively. Different
from the traditional dominance relation based rough sets, these multigranulation rough sets use a family of the
dominance relations instead of a single one for the target approximation. Not only the basic properties about these
dominance-based multigranulation rough sets are proved, but also the relationships among several rough sets are
discussed.
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