Era of large volumes of data that data increases exponentially has arrived. This is because the holdings of smart devices per use and one of the social services has increased. Regardless of the development costs and the importance of scale calculation of precise software in the early stages of development in big data project management, cost estimation study reflects the big data environment was not nearly done. In this study, for an attempt to overcome these limitations, we have proposed a FP method of applying fuzzy logic. The proposed method in this paper is to reflect the actual size of the components of the FP, it is possible to correct cost estimation. Only the level FP value associated with an increase(decrease) in the boundary value increases(decreases), it is possible to minimize the ambiguity even ripple effect FP during the early stages of development. Fuzzy FP method proposed in this study, it is possible to calculate the appropriate cost for large-scale software in big data environment.