[Objective] This study aims to establish a scientific and rational evaluation system for assessing the ecological recreation adaptability of urban parks, thereby providing a solid foundation for the planning, design, and application of ecological recreation systems within these parks. [Methods] The study employed the GST (Gray System Theory) method and the AHP (Analytic Hierarchy Process) method to select and compute the evaluation indices for the ecological recreation adaptability of urban parks. Internal tourists were chosen as the study subjects, and questionnaires were randomly distributed to score each index element in the evaluation. [Results] (1) Through gray screening, 15 subjective and objective indicators were determined, including the distribution density of recreational resources, species richness, etc. Six indicators (recreational resources grade, rainfall, air quality, health quality, population density, and the proportion of tertiary industry) were excluded due to their lack of direct relevance to evaluating ecological recreation suitability or their low scalability. (2) The weight ranking of the criterion layer shows that the ecological environment carrying capacity (0.5762) is the most important, indicating that in the evaluation of the ecological recreation adaptability of parks, the ecological environment status is a key consideration factor; ecological recreation behavior (0.2152) and ecological recreation resources (0.1614) follow next. The social and economic conditions (0.0472) have a relatively lower weight. (3) Within each index layer, the highest importance was assigned to the distribution density of recreational resources C1 (0.6334), the species richness C6 (0.4173) of ecological environment carrying capacity B2, the recreational space layout C11 (0.7134) of ecological recreation behavior B3, and the traffic accessibility C12 (0.5534) of the social and economic conditions B4. (4) The comprehensive score for the ecological recreation adaptability evaluation of Yangshan Park was 3.924 points, categorizing it as “good”. The ecological recreation resources were rated as good, with a comprehensive score of 3.5431 points. The ecological environment carrying capacity was rated excellent, achieving the highest score among the four dimensions at 4.2364 points. The ecological recreation behavior was rated as good, with a comprehensive score of 3.8563. Socio-economic conditions were also rated as good, with a combined score of 3.2695. [Conclusion] The ecological recreation adaptability of Yangshan Park is generally at a good level, reflecting the characteristics of ecological recreation adaptability in current urban parks to a considerable extent.