Jack London is an outstanding realistic writer in the American modern times,creating 19 novels and 125 short stories.He came from a poor working class family.Through his hard work,he finally became a world famous writer.However,he ended up with suicide of his 40-year-old life after his success.Jack betrayed his success in the way of death.This outcome is not only the end of life,but is also a negative to the empty life.What on earth is the meaning of life?This paper analyzes the reasons for Jack’s disillusion from the aspects of his family background,the era he lived,his experience,his education,his works and his outlook on life. Jack London is an outstanding realistic writer in the American modern times, creating 19 novels and 125 short stories. He came from a poor working class family. Through his hard work, he finally became a world famous writer. Yet, he ended up with suicide of his 40-year-old life after his success. Jack betrayed his success in the way of death. This outcome is not only the end of life, but also a negative to the empty life. What is earth is the meaning of life This paper analyzes the reasons for Jack’s disillusion from the aspects of his family background, the era he lived, his experience, his education, his works and his outlook on life.