Huck is the central figure in the novel and a famous image of children with a sense of justice and rebellious spirit in the history of American literature. At the beginning of the novel, although he is lively and loves a free life, due to the long-term influence of racist reactionary preaching and social atmosphere, he discriminates against Jim and often plays tricks on him. He once wanted to write to report Jim's whereabouts. After walking with Jim for a day and a night, he finally recognized Jim and decided to help him get free. The novel describes the result of Huck's inner struggle in a dramatic way: he picked up the letter and said, "Well, go to hell", and then tore it up at once. This very vivid description, as the writer said, is that "a sound mind (that is, democratic ideal) conflicts with a deformed consciousness (that is, racial prejudice), and the deformed consciousness loses the battle." Huck's change of thought and his repeated actions to help Jim tide over the difficulties show that since the fallacy of racism can't fool even a child, the collapse of slavery is indeed a historical necessity, and it also shows the writer's advanced idea of advocating whites and blacks to work together to create a democratic and free new world.