An Invitation Letter from Nature series is Xue Tao's first set of nature-themed picture books. Since childhood, Xue Tao has enjoyed getting along with the plants and animals in nature and felt the rise and fall of all beings with a sensitive heart. This set of picture books for nature and ecology education just pays tribute to nature, as well as to a vibrant childhood.

An Invitation Letter from Nature series focuses on the theme of nature in the form of transitions through the four seasons. It currently has five books: Epic of Mountain Forests, Day and Night of the Little Wooden House, One Year of Me and Tree, Missing Bugs and Grass, Birds and Little Beasts as Companions. Each book has its own theme, just like five different landscape paintings, presenting different life experiences.

One Year of Me and Tree takes one year as the timeline and presents the growth of the little boy and the tree. The tree adapts to the four seasons' changes and becomes one with the earth and the sky. The boy is also growing up joyfully day by day throughout the year and integrates with nature.