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This paper studies comprehension ex-post evaluation of multi-object and multi-layer projects by grey cluster evaluation model, analytical hierarchy process and experts investigation method. In order to study it, the ratio value index, before and after change threshold value index are constructed. At the same time, a comprehensive ex-post evaluation model is constructed and evaluation steps are given also. Finally, a sample is given to illustrate the rationality and validity of this model proposed in the paper. The results indicate that comprehensive ex-post evaluation model constructed in this paper can deal with problems of poor information and grey type coefficient without prominence differences better for projects comprehensive ex-post evaluation.