This paper focuses on evaluating weapon system project, we will develop a fuzzy multiple criterion approach. The framework of the approach as following: Firstly, we can differentiate the weapon system that we shall evaluate into multiple criteria according decision requirement, then establish multiple hierarchical evaluate items under each evaluate criterion. As we establish the evaluate criteria and hierarchy, give a fuzzy score for each evaluate criterion. Then we can compute the weight of each criterion according to the fuzzy score. Afterward, we can employ the fuzzy score compute rule that we develop in this paper, from the bottom to the top, compute the overall fuzzy score of each evaluate project. Finally, selection the best project according to fuzzy ranking.