Biophilic architecture includes the use of natural elements in the design and construction of buildings and urban spaces. One of the most important benefits of integrating the natural environment with buildings and structures is to enhance well-being and mental health and reduce stress. The present study aims to evaluate the impact of biophilic architecture and its role in the environmental graphics of Kermanshah Mountain Park on the mental health of visitors. Therefore, four important indicators and core components on the mental health have been identified. The statistical population of this study contains the visitors of Kermanshah Mountain Park, and based on the Cochran formula the sample size is 384 persons. A questionnaire was designed according to the identified indicators and distributed randomly among the persons. In order to analyze the quantitative data, SPSS software and for analyzing of statistical tests, the Friedman test and T-test were used. According to the results obtained, among the 4 indicators as "natural elements", "characteristics of spaces and places", "spirituality" and "psychological comfort"; the indicators of psychological comfort, characteristics of space and place, and spirituality are in a favorable condition and have a positive impact on the mental health of visitors. Only the indicator of natural elements could not meet the threshold and had the least impact on the mental health of visitors. On the other hand, according to the visitors, the components such as visual connection with nature, water, prospect and refuge, freedom of emptiness, stress reduction, and space for contemplation received the lowest rankings among 17 components, accordingly for which some solutions were proposed.