Jack London is one of the most outstanding naturalistic writers in America who composed many renowned full-length novels. Jack London's short story,"To Build a Fire"is a good reflection of naturalistic tendencies. It chooses"To Build a Fire"so as to fully understand his perspective of naturalism. First, it provides a brief introduction to Jack London and this short story. Sec?ond, it specifically displays naturalism in this short story from four aspects. Among them, objective authenticity is the most distinc?tive feature in naturalistic elements. Meanwhile, his literature creation is also deeply influenced by Darwin's theory of evolution. It aims to investigate gold seeker's failure that reflects natural selection and theory of survival of the fittest. Finally, it concludes that only by respecting nature can human beings survive in natural selection. Through the analysis of gold seeker's tragic fate, it warns that the readers should master wild survival skills and live in harmony with nature.