Huu Thinh is a typical author of anti-American poet generations. Under the ecological criticism, the article focuses on the aesthetic systems related to the nature, plants in Huu Thinh's poetry. As a poet in the war time, Huu Thinh's poetry contains many natural imagery in which tree is considered as a symbol of multiple meanings. Trees in Huu Thinh's poetry are expressed the fierce in war, in line with the survival in the battle. On the other hand, trees in his poetry are expressed the depth of the lifetime in the peace time. Trees in Huu Thinh's poetry are actually the metaphor of the human destiny, the life and the ideal of living. Then, the poet expresses the human's point of view, worldview, aesthetic sense and his philosophy of life.