The relevance of the study is determined by the need to create a sustainable, comfortable, safe, and accessible environment for people with disabilities (PWDs) in modern public open spaces (POS). Green parks are key elements of landscapes of POS and urban sustainability, improving the quality of the environment and life of society. Design, reconstruction of the landscape organization of green POS and, in particular, green parks, based on principles of Universal Design (UD), allow all city dwellers, including PWDs, have equal conditions in receiving positive emotions from communication with nature, comfortable rest, play sports to maintain self-confidence. Objects of study are green urban green parks in the hilly terrain of Vladivostok, requiring landscape adaptation for PWDs. The goal of the study is the development of an experimental project proposal for a green park in hill terrain based on UD design guidelines. To achieve this goal the study summarizes the theoretical sources for the use of principles of UD when forming green POS; analysis the availability of elements of an accessible environment in green parks in hill terrain of Vladivostok; performed the experimental projects for landscape adaptation of green parks for PWDs in hill terrain of Vladivostok, based on principles of UD.