Abstract: In order to estimating the effect of the land reclamation projects, we use the fuzzy mathematics comprehensive decision making model to build the effect measure index system from the data of social, economic, environmental and linkage. Then, it is adjusted by the actual Wuyuanwan project and determined the index weight by experts estimate method. Based on the valuation index vector obtained and the evaluation set assigned, the results show that valuations of Wuyuanwan project as “good” and “the better” reached 0.80. It means that the combined effect of Wuyuanwan project is a successful case. From the index analysis of first level evaluation, the case in terms of social effect and political effect are much successful, the "good" reached 0.73 and 0.90. From the second evaluation index analysis, the case in the social benefit, social adaptability, environmental quality and regional adaptability are better, the “good” reached 0.76, 0.71, 0.51 and 0.90. But the erosion and deposition environment and resources environment are insufficient, the maximum degree is assigned as “general” or “poor”. The evaluation results are basically verified in accordance with the actual situation, its scientific nature and effectiveness.