In equipment demonstration, it is a difficult task to map vague operational requirements onto quantitative requirements of operational performances logically and reasonably. A requirements analysis approach based on the Quality Function Development (QFD) and Analytic Network Process(ANP) is proposed to solve this problem. It can help analysts to understand the causal relationship between factors and make reasonable judgments. Operational performance ratings can be obtained in the structured operational requirements analysis procedure. Finally, an example is presented to validate the proposed method.