Orbital protrusion is the most common symptom of orbital disease and is often associated with eye pain, headache, or vision loss, whereas in some orbital apices or orbital tumors the volume is small and often asymptomatic and may only be detected on physical examination. The protrusion of the eye is mostly unilateral, but may be bilateral. The difference between the two eyes is greater than 2mm, or the prominence of the eye grows during observation is diagnostic. Orbital tumors are the most common cause of lateral ocular proptosis, accounting for about half of all lateral ocular proptosis, including primary intraorbital tumors, secondary to periorbital tumors and systemic metastases. Next, orbital inflammation, vascular malformation, trauma or thyroid-related ophthalmopathy (TAO) can cause protrusion. In addition, reduction of orbital volume can also cause protrusion of the eye, such as abnormal craniofacial bone development and abnormal bone fiber hyperplasia. If one or both eyes are found to be protruding, it is important to visit the hospital in time to perform X-ray, CT, MRI and ultrasound examinations to detect the tumor, qualitatively diagnose, localize the diagnosis and determine the relationship between the tumor and important structures in the orbit such as the optic nerve.