In the group evaluation, the density of information is not considered before. therefore, the paper proposes a method
of multi-phase group evaluation information aggregation based on density operator. Firstly, the grouping for evaluating data
and the determinate method for density-weighted vector are given. Secondly, the following two new operators are concerned,
the density-weighted average operator (DMWAA) and the density-weighted average operator in an orderly manner (DMOWA).
The former is adopted when gathering the horizontal evaluation information for single-stage, and the later is adopted when
aggregating the vertical evaluated information for between-stage. Finally, a numerical example shows the validity for the
proposed method in qualitative and quantitative analysis.