Abstract: Objective: To explore the CT findings of the primary pleural tumors and improve the understanding of these diseases. Methods: The CT of 24 cases of primary pleural tumors confirmed by pathology were analyzed retrospectively. Results: Among 24 cases, there were 9 cases of mesothelioma, 8 cases showed pleural diffuse thickening irregularly together with multiple nodules, and 1 cases showed localized thickening of the pleura, 3 cases showed obvious inhomogeneous enhancement, 6 cases showed mild to moderate enhancement inhomog eneously, 8 cases of accompanied with pleural effusion, 3 cases accompanied with lymph node metastasis, 1 case accompanied with intrahepatic metastas and 1 case accompanied with intrapulmonary metastas. Among 7 cases of solitary fibroma, 3 cases were fusiform masses, 4 cases showed hemispherical masses, and all 7 cases showed mild to obvious enhancement inhomogeneously, 5 cases showed "pleural tail" sign and 2 cases accompanied with pleural effusion. 5 cases of neurilemmoma all showed "pleural tail" sign, 1 case showed fusiform mass and 4 cases showed spherical mass, and all 5 cases showed mild to moderate enhancement inhomog eneously. 1 case adipofibroma showed fusiform mass with fatty density mainly and clear boundary, and a little fibes with mild enhancement.1 case synovial sarcoma showed huge irregular mass and with inhomogeneous enhancement, accompanied with metastasis of the left adrenal with circular enhancement. 1 case inflammatory myofibroblastoma showed spherical mass with equal and mild low density, and with inhomogeneous delayed enhancement obviously. Conclusion: Primary tumor of the pleura is rare in clinic but is varied in variety, the CT characteristics of different tumors are different, and CT show important value for the diagnosis and differential diagnosis.