The concept and assumption of green medicine were proposed according to the effect and mechanism of green space on human health. To explore the possible realization path of green medicine as a complementary therapy to restore the physical and mental health of residents, this paper took green healthcare, including garden healthcare, forest therapy, agricultural therapy, etc., as the main body, expanded the range of natural elements used in green healthcare, and concluded the type of appropriate nature-assisted therapy dominated by green healthcare. On this basis, the implementation strategy of nature-assisted therapy in multi-scale green space was discussed in depth, including an assessment of needs, a compilation of planning, implementation process, and other contents, and the practice system of nature-assisted therapy with green healthcare as the main body was constructed, to provide suggestions for the integration practice of green healthcare.