Reservoir evaluation is the foundation of selecting and predicting the oil field favorable areas. In order to solve the problems of subjectivity and inconsistent of judging matrix, which are encountered in the traditional AHP method, an comprehensive reservoir evaluation method based on improved AHP method is proposed. The method constructs judgement matrix to reduce the expert's subjective bias by using group AHP method and quasi-optimun consistent matrix and to solve the inconsistent problem of judging matrix by using least square principle. Then, the bottom indicators are divided into non-quantifiable indicators which obtain the evaluation vector by using experts' evaluation method and quantifiable indicators which obtain the evaluation vector by using the utility function method and grey AHP method. Finally, the comprehensive reservoir evaluation is calculated by the evaluation vector and the indicator weight of each layer. The results show that the proposed method can obtain the reservoir evaluation standard more objective and scientific. The reservoir evaluation standard can improve the development effect of the study area and provide favorable basis for adjusting the subsequent development programs.