Dinosaurs in the animal classification system, to the Class of reptiles under the Saurischia and Ornithischia. Reptilia one of the characteristics of animals is not a constant body temperature. Therefore, people generally agreed that before the dinosaurs should also be cold-blooded animal. Cold-blooded animal due to metabolic slow, the body produces very little heat, so also known as cold-blooded. In contrast, some animals due to high metabolism, the body produces more heat, so that the body temperature is higher than the ambient temperature, but also maintain a constant, such an animal called a thermostat animals, also known as warm-blooded animals. are animals, birds and mammals are warm-blooded, in addition to all the animals are cold-blooded animal. With the expanded in-depth study of dinosaurs, people from the traditional form of description, classification and identification of development to the physical, ecological, behavioral habits such as research, as well as skeletal structure, composition of research and study of genetic material and so on. In this process, some scientists dinosaurs were cold-blooded animal's views of the doubt and waver in the 20th century, since the 70's, proposed the blood of dinosaurs theory. The past 20 years, the discussion on the blood of dinosaurs reached a climax, makes a variety of reasons to deny the view of dinosaurs as cold-blooded animals, and even think that this is a revolution in the ancient biology. Dinosaurs were reptiles upright walking, they stop the activity, the completion of feeding, to avoid predators, reproduce and coordinated behavior in group activities. In these activities, most agile dinosaur, sport faster, with a strong operational capacity, their fast-moving nature of this standing and to consume more than crawling and slow movement of energy. The energy consumption required by the quick release of a large number of metabolic energy to complement, rather inevitably accompanied by a fast metabolism, high body temperature constant. Therefore speculated that some dinosaurs were warm-blooded animals without reason. Dinosaur bones on a cross-section, showing a large number of Harvard University's board structure and management at Harvard's, Harvard's pipe is a place through the blood vessels and nerves. This structure in the hot-blooded mammals and birds of the bones is very common in the few cold-blooded animal. Therefore, the scholars engaged in research in this area should be that dinosaurs, like mammals and birds are warm-blooded animals.