According to the shortages of optional plan and optimal solution in decision-making system, we put forward a new rough lattice order decision-making model, which is based on the rough decision-making analysis method of dominant relation. The method of rough decision-making analysis, based on dominance relation, is discussed in the article, also provide new method of selection, establish partial order relation based on P-set and present construction method of optional plan lattice structure, which is based on dominance relations, thus we can choose optimal scheme reasonably. Finally, an application instance will be given.