在產品概念設計階段，設計師透過草圖的繪製將想法由抽象轉為具象，使得產品概念發展是新產品開發過程中，直接影響未來新產品上市成功與否的要件。然而新產品的開發過程充斥著不確定性與風險性，如何有效的設計評估是重要關鍵。因此，本研究應用模糊綜合評價法進行產品設計方案的擇優評估，並以衛浴設備產品設計為案例，說明及驗證此模式之適切性。研究顯示，此評估方法除了兼具實用性與客觀性外，亦可協助決策者在複雜及不確定的環境下進行決策，同時提供產業界可遵循的新產品開發機制。如此更能增加產品開發成功之機會，降低產品上市之風險。

In the product conceptual design stage, the designers through the draft will be the idea from abstract to concrete. The product concept development stage is critical to the success of the product it precedes the design stage and launch of the actual product development process. However, the process is risky and uncertain. Efficient design evaluation is crucial to avoiding the risk of new product development. In this paper, we construct a fuzzy synthetic evaluation method for selecting an optimum design from various design alternatives is proposed. A sanitary equipment product design is presented in this study to understand the characteristics of the proposed method. The result shows that the evaluation methods of practicality and objectivity, it is also can help decision makers, promote the decision quality and provide the industry with a set of new product development mechanism to follow. In doing so, the chance for success in the new product development can be increased and the market risk for it lowered.