This book is the representative work of Swedish female writer Selma Lagerlof, who won the Nobel Prize for Literature in 1909. It has been translated into more than fifty languages. The plot of the book is relatively simple. It tells the story of a 14-year-old boy named Nils. He lives in southern Sweden. He doesn't like to study and study. He is naughty and likes to play tricks on small animals. One early spring, Niels's parents went to church. He played tricks on an elf at home, and the elf turned him into a little man as big as a thumb. At this moment, a group of wild geese flew over the sky, and a male goose at home also wanted to spread its wings and follow the wild geese. In order to prevent the male goose from flying away, Nils hugged the goose's neck tightly, but was unexpectedly carried high into the sky by the male goose. From then on, he rode on the back of the goose and followed the geese as they traveled around the country. He flew from his hometown of Skåne to the northernmost province of Lapland, and it took him eight months to return. He saw the beautiful scenery of his motherland while riding on the back of a goose, learned its geography and history, listened to many stories and legends, and experienced a lot of risks and sufferings. During his wanderings, he learned many advantages from his traveling companions and other animals. When he returned home, he turned into a tall and beautiful boy, and became a gentle, kind, helpful and hard-working good boy.