The aggregation approach of multi-stage linguistic evaluation information is studied. The linguistic information
is transformed in two-tuple linguistic ways. The check index of quantitative change, qualitative change and the evaluation
quality index of decision maker are proposed according to the alternative development rule. The weight of stage is set up by
the stage grey relation calculated with the stage weight setup in advance. In addition, the weight model of decision maker is
precented based on the least distance group preference. Then, the group aggregation method of the multi-stage is developed.
An example shows the application process and efficiency.