Abstract: Objective: To improve cognition of degenerative lesion in lumbar zygapophysis. Materials and methods: To analysis the CT images of the 60 cases with bone window and soft tissue window. Results: in 60 cases,CT findings of degenerative lesion in lumbar zygapophysis were founded proliferation hardening in 14 cases,hypertrophy in 6 cases,bone rarefaction in 21 cases,osteophyma in 18 cases,subluxaion in 9 cases;it was founded cataplasis in joint space with narrowing in 20 cases,unevenness in 17 cases,underpressure in 19 cases,corpus liberum in articular cavity in 6 cases;it was founded changes in articular facet with uneven in 53 cases,hardening in 34 cases,calcification in articular capsule in 5 cases,calcification with arcuate ligaments in 5 cases,and thickening in 4 cases. Conclusion: Thin slice CT scanning can accurately diagnose the degenerative lesion in lumbar zygapophysis and provid reliable images for treatmeat.