Abstract: Enhanced depth imaging optical coherence tomography technique (EDIOCT) is based on the traditional frequencydomain optical coherence tomography (OCT) and improved to reflect the choroidal organizational structure, can quantitatively measure the choroidal thickness, initially detect the choroidal blood flow situation, is a simple, fast, economical, and practical new method provided for clinical research. At present, this technology has been used to study a variety of retinal diseases, especially macular disease，such as central serous chorioretinopathy, agerelated macular degeneration, polypoidal choroidal vasculopathy，high myopia, diabetic macular edema, and macular hole etc.