The primary aim of this text is to provide a systematic introduction and a comprehensive conception to the environmental ethics. I introduces anthropocentrism, European humanitarianism, American liberalism, biocentric ethics, ecocentric ethics, deep ecology, social ecology, ecofeminism etc. Finally, I compare these environmental briefs and theories on the basis of "ontological claims" and "ethical traits". Through this comparison, I hope to offer some revelations and suggestions for the construction of new environmental ethics and the promotion of the ethical practices in the future as a reference.