It aims to introduce a symbiotic social system with the integration of the old, the foreigners and the normal people, with the help of scientific and technological means to make the guidance information produce the perceptual experience corresponding to the sensual sense of the elderly directly and guide the correct path seeking behavior. A model for forecasting future design trend is established. The model consists of problem definition, focus group, PEST analysis, cluster analysis, building customer journey map and evaluation. The service design idea of the elderly personal exclusive guidance system is discussed. Based on the transformation of the existing subway digital facilities, the design hypothesis of the interactive digital guidance system is based on the fixed point placement of the hardware, producing hot spot interaction and providing adaptive functions. Providing quick and visual guidance information for the elderly can save the brain and physical strength consumed in the process of finding the road. It has practical guidance and promotion value for the present situation of "unprepared old" subway guidance system.