The classroom evolved into a scientific background, which tells the story of a pupil, Ningning, who crossed the western part of Liaoning10.6 billion years ago and became a young bird. She experienced thrilling adventures and hardships and finally learned to fly. The film reproduces the geographical environment of western Liaoning in China in Jurassic and Cretaceous, and three-dimensionally restores the images of more than 20 feathered dinosaurs and early birds, and reproduces the great process of the origin of birds. With the nearly bird dragon as the core figure, the three growth stages of the nearly bird dragon baby have interactive plots with the dinosaur characters in the corresponding stages, and the evolution of red feathers is implied in the three plays.