Imaging examination plays an important role in evaluating the activity and prognosis of thyroid-associated ophthalmopathy (TAO). Ultrasonography can be used to analyze morphological change of extraocular muscles. Color Doppler imaging can display blood flow signal in real time. CT can detect morphological change of orbit and evaluate the ocular impairment. MRI can evaluate inflammatory response with a higher accuracy. Radionuclide imaging technology can evaluate the activity of TAO at molecular level.