Last Child in the Woods is the first book to proposed that direct exposure to nature is essential for healthy childhood development and for the physical and emotional health of children and adult published in 2005. The author Richard Louv puts forward the concept of “Nature Deficit Disorder”，and offers some practical solutions. Different from previous relevant literature focusing on the fields of pedagogy and psychology，this paper extracts the part of the book about the influence of nature on human beings，and analyzes from the perspective of rhetoric what rhetoric strategies the author uses to emphasize the importance of the natural environment to human health.