Abstract: Objective: Improved imaging in lumbar facet joint degeneration in clinical understanding.Materials and methods: Retrospective analysis of 80 cases of degenerative lumbar facet joint injury in patients with X-ray,CT,MRI imaging data,in the facet joint bone,proliferation and articular surface flatness,joint space(narrowing,vacuum sign),joint dislocation,facet fracture,yellow ligament calcification,articular cartilage,joint capsule swelling,synovial cyst,synovial cyst hernia in terms of three other shows to compare;and degenerative injuries caused by lumbar spondylolisthesis,the degree in the slip,location,type,diagnosis and surgery on three findings.Results: The result showed that CT displayed more clearly on the sclerotin of small joint axon,articular surface hyperplasia and smoothness,joint space,joint dislocation,joint nonunited fractures and yellow ligament calcification than X-ray and MRI,but MRI play ed a more important role in articular surface cartilage and joint capsule swelling,cyst synovial as well as synovial hernial sac.Besides,X-ray also helped to the articular surface hyperplasia and Joint space narrowed.When it comes to the lumbar spondylolisthesis degrees and positions,the three inspection methods made no differences.Also,CT had an obvious advantage than X-ray and MRI in judging the lumbar spondylolisthesis type accurately while.Conclusion: imaging each have theirown advantages and disadvantages in image diagnosis of lumbar smalljoint degenerative damage.So,we could choose a reasonable examination method by combining with clinical symptoms and signs,offering accurate image information for clinical diagnosis and one of the best treatment plans.