In today’s society, the children of elders are difficult to understand parents’ medical condition because of bustling work. The elder can’t remember much accountable matter during medical treatment. Therefore, their children also can’t acquire a comprehensive understanding of the real situation for elder’s parents through inquiry and result in many medical misconceptions. This paper tries to design a medical auxiliary product for elders based on this phenomenon. Firstly, this study use observation method gathering elderly information during a medical treatment and find the key problem, then go deep investigation of focusing problem through preprocessing, understanding and analysis. Finally, this research use methodology of 635 to design a medical treatment recorder for elder.