Objective To explore the diagnostic imageological characteristics of chondroblastoma in flat bone. Methods Various imageological data from eight cases of pathologically confirmed flat bone chondroblastoma were systematically studied, where the features encompassing lesions position, morphology, density and performances of CT/MRI dynamic enhancement were analyzed. Results Five out of eight cases of chondroblastoma lesions were located on skull, the other three were located on patella. These lesions mainly appeared as rounded or irregular shapes with expansive osteolytic bone destruction under computerized tomography (CT) scan, represented noticeable holonomic or nonholonomic sclerosing margin with or without inner demarcation, and showed patchy or punctate calcification sporadically. The lesions also exhibited inhomogenous mixed T1 and T2 signals and remarkable uneven enhancements under Magnetic resonance imaging (MRI). Conclusion Chondroblastoma in flat bone was mainly featured as expansile lytic lesion with punctate calcification and stroma enhancement under both CT and MRI scan. Nevertheless, clinic, imageology and pathology should be comprehensively integrated for precise diagnosis considering the low incidence of Chondroblastoma in flat bone.