In order to find a more effective method for real estate investment evaluation, the grey AHP is applied and hierarchical assessment system is presented. First, the grey-relevant method is employed to evaluate the profit of the investment. During quantifying the qualitative indexes, set-valued statistic analysis is introduced, which reduces the uncertainty of the real estate investment assessment. A case shows that the method is feasible and valid. This study has significance in theory and practice for the real estate investment management.