The praise for the vigorous natural life is the theme of D. H. Lawrence’s poetry, Birds, Beasts and Flowers. Snake is one of the best poems in this collection of poems which shows an introspection of the relationship between human and nature. This paper aims to analyze the paradoxes and conflicts in Snake and arouse human’s attention to ecology. Many studies on Snake focus on ecological consciousness, the symbolic image of snake, sexual consciousness, religious consciousness and Lawrence’s natural value. However, a few studies pay attention to its ecological ethics, especially the paradoxes and conflicts in this poem. This paper intends to analyze the paradoxical image of snake in traditional concept and Lawrence’s writing, the paradoxical personalities of human in the modern society and the conflicts between anthropocentrism and naturalism. Lastly, this paper tries to give some suggestions to human based on ecological ethics.