Abstract: Objective: To study the ultrasonic imaging character and differential diagnosis and pathologic basis of intraocular tumor. Methods: 34 cases of patientsultrasonic imaging character and differential points were reviewing concluded. 30 cases of them have been made pathologic examination after operation. Results: Where there are echoes in ultrasonic pictures, there are rich cells or compact tissues or calcifications, In weak echo place or no echo place, there are few cells, ncrosis, liquefaction or liquid exudation. Conclusion: The ceho intensity of ultrasonic is determined not only by the cellular density, the compact degree of tissues but also by whether threr are calcifications or not. Amount serofluid exudation, necrosis and liquefaction in the tail-like part of the choroid malignant melanoma is the reason for “dig hollow”phenomenon.