The inter-vertebral disc is an important part of human lumbar spine, it is valuable for bio-mechanics study of the lumbar spine and inter-vertebral disc. This study indicates that a new inner stress testing way for the inter-vertebral Disc Joints' Core has been provided and it also showed that the new way is an effective method for studing the inter-vertebral Disc Joints' Core. The data prove good results and coincide with another old way's results. All of these provide an estimation and basic theory for the inter- vertebral Disc Joints' Core study.