Joyce has the ability to understand the character's soul. His precise grasp of the characters is almost everywhere, and he can always draw these characters delicately. Here I have to mention a character Joe Dillon. He appeared in the opening moment, only appeared in the first few paragraphs, and was never mentioned again. However, he played a very important role in the whole story. He was the premise of this adventure and the resulting "accident". . Joe Dillon lets the children learn about the wild American West, lead the children to play the fierce Indian game, and always dance the victory. He is a kind of "wildness", his behavior and personality. There is a subtle influence on the partners, including the narrator "I."