O.Henry is one of the greatest short story writers in the world.His writing style is appreciated by many people,especially for a twist plot and the surprising ending.In language,O.Henry uses many rhetoric tactics to achieve the effect of making the stories more vivid and more humorous,such as exaggeration,metaphor,simile and so on.O.Henry always sympathizes with the poor,criticizes and satirizes the capitalists.The characters in his short stories are often the common insignificant people who have the valuable humanity.O.Henry and his unique writing style influence many following writers.