HMOO-1 type apparatus for measuring the internal pressure of bones was used to investigate the changes of the internal pressure of cervical intervertebral disc in dogs and pigs under different angles and drawing strenth.It provides theoretical proof to treat cervical dynamc stenosis in anterior flex with draft and osteotherapy. The results showed that negative internal pressure of the intervertebral disc varied with the angle and the drawing strenth, each of which had characteristic law of its own. It implies that this therapy is effficient and safe under the condition of decompression of spine and nerve root so as to release the soft tissue spasn and correct slides.