Cooking is an important behavior in daily life, but it is very easy to be dangerous in the kitchen. With the increase of age, the deterioration of physical functions causes many difficulties in cooking. The purpose of this study was to understand the difficulties of older people in the kitchen. In response to limited resources, identify the most urgent problems that need improvement, reduce the risks in the lives of the elderly, and achieve independent living and healthy aging. This study uses Quality function deployment combined with the participants’ and experts’ opinions to find the demand and physiological functions that need to be assisted and improved most, and provides a reference for future research, assistive devices and smart home development. Use Scenario-Based Design to discover more ideas for participants and gain a deeper understanding of the problems encountered by the elderly. In the end, the problem that needs to be improved is “Forgot cooking something and do something else”. The physiological functions that need to be assisted most are hand stability, attention and memory. In the future, the development of assistive products for the elderly can be carried out in the direction of tactile feedback and vibration reminders. It can be used on hand devices in conjunction with other sensory functions.