Abstract: Objective:In order to improve the diagnosis and treatment for intervertebral discitis.Methods:The clinical characteristic, MRI, CT scan, ECT and X-ray film of the eighteen cases of intervertebral discitis of lumber spine be analyzed. Results:The main features of X-ray plain film, tomogram and CT scan were presented as: Narrowed intervertebral space, bone damage of vertebral body, proliferation and sclerosis. Persistent abdominal distention was the early and important sign of secondary discitis. MRI shows the T1-weighted decreased signal and GDTP enhanced shows a increased signal in the body of discitis. ESR and C-RP were higher in all of the cases.Conclusion:1. MRI is very useful in the differential diagnosis with tumor, TB, and degenerative of the lumbar intervertebral space. 2. C-RP and ESR play a very important roles in calculate the effect of treatment. 3. It is necessary for treatment to use large dose of antibacterial medicine in the early stage. 4. Percutaneous procedure is very useful to diagnosis and treatment. 5. When half of the vertebral body was involved or there were signs of compression of the nerve roots, surgical and decompression were indicated.