Abstract: Down and Out in Paris and London is an autobiography of George Orwell, describing the author's vagabond life in Paris and London, which probes into the reason and harm of vagabond phenomenon, and full of powerful political criticism. Orwell used humor to create the humorous images of the tramps, with the techniques of writing grief with joy and humor, and gave a detailed description of poverty and hunger. It has the power of authenticity in biography literature.