The work aims to explore the possibility of museum participating in building a Dementia Friendly Community based on the need to create a good physical and mental treatment environment for dementia patients in the context of aging. Service design thinking was introduced. With the rational use of the important role and key resources of museum in community, different strategies for the three dimensions of "public", "patient family" and "patient" and specific conceptual design plans were proposed. The service design method for museum participating in building a Dementia Friendly Community based on physical and cultural environments can match the differentiated needs of different stakeholders, such as public awareness training and popular science, positive atmosphere building of patient family, and improvement of patient's self-esteem and social participation.