This research was aimed to explore the correlation between emotional design and the users' emotion, as well as to verify the influence on emotional arousal evoked by the features of different designs in the mutual interaction between humans and products. In 2002, as Norman proposed the 3-level definition separately composed of the instinct, behaviors, and reflection of emotional design, these were meant to describe the influential factors happening to the interactive processes between humans and products. In 2003, Desmet proposed an emotional scale titled PrEmo applicable to measure the self-report inventory of the emotion arisen from products. After questionnaire surveys were conducted in accordance with the aforesaid scientific literatures, data were collected with product examples substantially operated. It was meant to analyze the emotional difference arisen from various extents of emotional arousal. Also, the experiment was conducted to discover the emotional difference arisen from user's operation on different products with various extents of emotional arousal. Research results were inclusive of the items mentioned as below: (1) During the phase of visual stimulus, the purchase intention arisen from the products with emotional design were typically higher than those of the commodities for daily life; (2) In view of the products with emotional design, the purchase intention after hand-on operation was higher than that before experiencing; (3) After using the products, the satisfaction to those commodities for daily life was remarkably higher than those products with emotional design.