Abstract: Considering the lack of traditional evaluation methods,which do not take the evaluated object into account,this paper proposes a new method of group evaluation group evaluation based on collaboration of subject and object.Firstly,the process for the evaluation of subject and object collaboration is described.Secondly,in order to get the result for subject evaluation,the method of subject information gathering based on density operator is given,so that the result for subject evaluation is got.Thirdly,in order to obt ain the result for object evaluation,the object information is adjusted accordingly.Finally,these results are gathered and then the final result is shown.

Key words: group evaluation, collaboration, subject and object, aggregation