Abstract: The present paper describes the histological aspects of two individual skeletons, assigned to species of Ankylosauridae (Ornithischia) and Titanosauridae (Saurichia) respecüvely, newly discovered from the Late Cretaceous Huiquanpu For-nation in northern Shanxi Province, and reports the results of comparison between the dinosaur's, the modem reptilian and avian limb bones. The observation on the thin sections of dinosaur's limbs, ribs and vertebras has revealed their microstructral and histomorphological features. Comparative histological study on the limb bones of the dinosaurs, the modern crocodile (Crocodylus porosus) and of the ostrich (Struthio camelus) was -carried out, and an image analysis on the microphotographs of the compact bone of these bone samples by using a computer system was also performed, and obtained the following results.