Abstract:The personification had been used in the novel the Call of the Wild by Jack London to depict the world in the eyes of the dog incisively and vividly and reflect the cold reality of capitalist society and the objective reality --survival of the fittest. He parables the dog into men，even himself. Buck desired and ran to the freedom, and this is the pursuit of the writer Jack London and also the reflection of his idea. This paper uses ecological criticism to show why Buck change eventually and return to the wildness, and find out the real causes that why Buck return to the wildness by using the survival of the fittest theory as well as attempt to analyze these causes and indicate people for some inspirations.
Key words: the Call of the Wild; Buck; the survival of the fittest; ecological criticism