Abstract：Jack London (1876—1916) is a famous American realistic writer who consistently used the writing technique of naturalism to describe the ordinary people's living conditions.In the novels of All Gold Cayon and The Valley of the Moon, he held the idea of anthropocentrism.But later, London was more and more inclined to eco-centrism, which believes that nature is the source of all creatures and human beings is only a part of nature.The relationship between nature and human beings should be reciprocal and harmonious.In order to keep this harmonious relationship, human must restrict his desire for the material.Otherwise, the balance between human and nature will be broken.London took ecological responsibility voluntarily and realized the transformation of Ecological self gradually.Jack London's ecological thought is embodied in his works, which need out careful interpretation.

Keyword：Jack London;All Gold Cayon;The Valley of the Moon;ecological thought;