The construction of an aging -appropriate environment for public transportation meets the needs of an aging society. This paper takes the aging-appropriate facilities of public transportation in Wannsee District of Berlin as an example, and analyze the behavior needs of the elderly in Germany to take public transportation from several aspects such as visual accessibility, auditory accessibility and behavioral accessibility to summarize the aging-appropriate design of public transportation carriages, waiting cars and transfer facilities, which can serve as a reference for the aging-appropriate design of public transportation facilities in other countries.