Among a minority of Longfellow's studies in China and abroad, there has even scarcely been one made from the perspective of eco-criticism. Eco-criticism aims at exploring the relation between literature and natural environment to find out the ecological wisdom in literary works so as to awaken the ecological consciousness of the contemporaries. Henry Wadsworth Longfellow, a poet concerning much about nature, in his nature poems, shows the value of nature by evoking people's love and care for nature, and makes them reconsider the Man-Nature relationship so as to seek the ecological balance on earth, including that from within the human world. By reading Longfellow in the light of certain eco-ethical ideas, it is not difficult to discover the legacy glittering with ecological wisdom in his poetry. Such wisdom is highly connected with Longfellow's "environmental niche". Nowadays, with the increasing deterioration of the environment, the ecological wisdom implied in Longfellow's poetry is of tremendous significance.