Eye tracking refers to tracking eye movement by measuring the position of the eye's gaze point or the movement of the eyeball relative to the head. This paper introduces the eye tracking technology, focuses on the recent research progress, analyzes the various eye tracking technology principles, and compares the advantages and disadvantages of various measurement methods in detail. With the continuous development of eye tracking devices and their wide application in various fields, we further introduce the development trend of eye tracking at home and abroad by comparing the characteristics of several new eye tracking devices. Finally, the research direction of eye tracking technology is introduced, and the application of eye tracking technology is prospected.