Abstract: Objective: To analyze the radiographic features of mandibular cone beam computed tomography (CBCT) films in patients with idiopathic condylar resorption (ICR). Methods: Forty-one ICR patients on their first visit to the Department of Orthodontics were selected as the experiment group, and 41 healthy volunteers were served as the control group. Mandibular indicators on CBCT were collected by Invivo5 software and the statistical differences were analyzed by SPSS 17.0. Results: Indicators that showed significant differences between the experimental group and control group included SNB, NP-FH, S-Go, Co-Go, S-Go/N-Me, H, ACo-PCo, PCo-Co , angle of anterior slope, S-Ar-Go and Co-Go-Me (P<0.05), while those showed no significant differences between two groups included N-Me, Go-Me, S-PCo, ACo-Co and angle of posterior slope(P>0.05). Conclusion: Bone resorption in ICR mainly occurred in the top and anterior slope of the condyle, resulted in reduction of condylar height, which was a main feature of ICR. The mandibular retraction in ICR patients was caused by the rotating of the mandible rather than the receding of the condyle.