Conflicts and differences often occur in the design decision of different professional background users. In order to further clarify the physiological mechanism of the difference, the eye movement track in the process of product design decision is studied. The eye movement tracking method is used to select the important eye movement index. The students' professional background and the completion of the design work are the independent variables. Through the chi- square analysis and the repeated measurement of variance, the eye movement mechanism in the design decision process is studied. Professional differences have a significant impact on the eye movement of the product decision process. The degree of completion of the work also has a significant impact on the eye movement related indicators and has an interaction with the professional background. Users of different professional backgrounds have different points of concern in product decision making, which are important reasons for decision-making conflict. From the perspective of eye tracking, a new explanation for this phenomenon is provided.