Abstract: Objective: To evaluate the diagnostic value of 64 multi-detector helical CT of the tibial plateau occult fracture.Methods: MDCT scans were performed in 21 patients who were suspected fracture of tibial plateau but negative(12 cases) or probable positive(9 cases) on X-ray film(including CR and DR).The data's was transmitted to ADW4.3 workstation,and reconstructed by MPR,MIP,VR and generally analyzed with original axial images.Results: MDCT 3D demonstrated Schatzker type Ⅰ 10 cases;type Ⅱ 4 cases;type Ⅲ 3 cases;Ⅳ 2 cases;type Ⅳ 1 case and type Ⅴ 1 case.Conclusion: 21 cases fracture of tibial plateau were demonstrated clearly by 64-MDCT,and it can reveal the location,types,level and complication of fracture change,it is reliable and accurate in evaluating occult fracture of tibial plateau,gradually become necessary modality examination in patients after trauma of knee joint and therefore should be applied to clinically suspicious cases.