Objective To evaluate the imaging characteristics of PPSS (Pleuropulmonary synovial sarcoma, PPSS) and improve its diagnosis. Methods The clinical, imaging and pathology findings of 6 patients were retrospectively analyzed．All 6 patients received X-ray and 5cases had CT scan, 2 cases had MRI. Results Enormous mass in lungs were found in X-ray and their scope were 3cm×3cm×1.5cm to 15.3cm×22.5 cm×16.9cm. Peripheral tumors which showed clear margin partly will inhomogeneous density, was found in CT scan, and no calcification in the lesion. On the contrast-enhanced CT scan, 5 cases were inhomogeneous enhancement. Pleural or interlobar fissure invasion were detected in 3 patients. No llilar or mediastinal lymph nodes metastasis were seen in all cases. MRI showed T1WI were slightly low signal, T2WI were slightly high signal, the mass had mild heterogeneous enhancement．Lymph node metastasis was not found in pathologic. The immunohistochemical examinations of Vim, CK and EMA were positive in 6 patients. Conclusion There are some relatively specific imaging findings of primary pulmonary synovialsarcoma. Understand imaging findings will help clinical surgery and prognosis guidance, accurate diagnosis depends on pathology and immunohistochemistry.