Under the trend of “Material Turn” in design, the research focus of modern historic parks’ auxiliary facilities has transferred from heritage value preservation to present-day value enhancement; the connotation of auxiliary facilities has been expanded to non-municipal facilities to support multiple functions and services and to meet the public’s demands. The specific relationship between users’ demand and the status quo of ancillary facilities, as well as targeted design specifications for ancillary facilities in modern historic parks, needs to be explored in depth. Taking Fuxing Park as an example, this study measured the status, users activities, satisfaction, and demand of its ancillary facilities and compared it with the existing related design specifications of ancillary facilities. Results show that: (1) The existing design specifications of urban parks do not meet the public’s demand for auxiliary facilities in modern historic parks. (2)The auxiliary facilities of Fuxing Park can be divided into four categories according to the urgency and content of improvement. (3) There is no significant correlation between user characteristics and satisfaction with the ancillary facilities, but different demographic and sociological characteristics show different associations with activity preferences and facility improvement suggestions. It indicates that the users’ demand for the auxiliary facilities of modern historic parks has transitioned from the “bottom line” requirements of quantity to quality and management improvement. In future research, “quality improvement” should be embodied in the improvement of types, functions, and services and the design specification of auxiliary facilities in modern parks. It is suggested that decision: makers should focus on the diversification of ancillary facility types and refined management and formulate a quantitative design specification and detailed management requirements.