Abstract: The issues about the origin and evolution of the birds have been the hot biological topics since the first discovery of the Archaeopteryx. The question of the origin of birds includes many biological aspects, such as the morphology, flight and feathers. The exceptionally and exquisitely preserved feathered dinosaurs and Mesozoic birds fossils in the Early Cretaceous Jehol Biota and Jurassic deposits in Northeast China provided highly important evidences on the dinosaurian origin of birds, and increased our knowledge about the evolution of feathers. The researches on the feathers of feathered dinosaurs were mainly reviewed, and the origin and evolution of feathers, combining evidences from developmental biology.