One of the dinosaurs, named anchiornis huxleyi, has extensive plumage and profusely feathered feet.
Dr Xing said it had provided important new information on the origins of birds and the evolution of feathers.
He went on: "This fossil provides confirmation that the bird-dinosaur hypothesis is correct and supports the idea that birds descended from theropod dinosaurs, the group of predatory dinosaurs that include allosaurus and velociraptor."
Read one of the articles here: Scientists hail new species of feathered dinosaurs.
Another here: Five new 'dino birds' dug up