Female consumer market has trend to overtopping other consumer market in recent years. Designers in this field have to create new product constantly. The purpose of this study is to analysis the purchasing decision of high heels, therefore, designers can be more easily, efficiently and accurately to reach the real needs of consumers. This study use 5W1H to extract design features of high heels, and then the Interpretation of Structural Model (ISM) is to definition the purchasing decision. Next, use Grey System Analysis (GRA) to find the optimal strategy of purchasing decision. Finally, Quality Function Deployment (QFD) is to determine the guidelines that designers could be followed. The results show that emotional thinking is preference when women buy high heels. And in emotional thinking (Kansei strategy), heel, materials and skeleton of shoes are 3 important design factors for considering.