Abstract： A 59-year-old male presented with a 1-year history of proptosis in the right eye.Ocular examination revealed proptosis,global displacement,limited adduction and infraduction and slight conjunctival hyperemia in the right eye with increased orbital compartment pressure(T+2).The rest of the physical examination was unremarkable.Radiological examinations demonstrated that a soft-tissue mass involving both intraconal and extraconal space was located behind the globe and at the nasal and downward side of the optic nerve,which was tightly adjacent to the optic nerve,medial rectus and inferior rectus.The internal signal of the tumor was inhomogeneous.The signals of the upper and under part were different in the MRI:the upper half of tumor body was enhanced obviously and the lower half was not enhanced.Thus,an orbital tumorectomy through lower eyelids was performed after hospital admission,and a diagnosis of solitary fibrous tumor was confirmed by histopathological examination.Discussion and experience:for orbital solitary fibrous tumor,incomplete resection led to the recurrence of tumor.There is a tendency of malignant transformation,even threatening the patient's life in partial cases.For orbital tumors with atypical imaging features,differential diagnosis before operation,appropriate surgical approach and complete resection are important to the prevention of tumor recurrence.