The real estate industry has multiple inputs and outputs characteristics and is influenced by subjective factors greatly. The combination of DEA and FCA is applied to this typical complex system. In the comprehensive evaluation system, for quantifiable indicators, the relative efficiency of every DMU is calculated based on DEA and then fuzzified by membership functions. The result of DEA is of great objectivity, making FCA more convincing instead of expert scores. It provides a new method to evaluate comprehensive systems. This is a case study to research the effectiveness of real estate investment in 8 Provinces of China.