In order to solve the problem that the adaptability of visualization techniques in the evaluation of oil displacement agent was not clear，the principles and functions of visual micro displacement model，X-ray computed tomography（CT）and magnetic resonance imaging （MRI） were compared. Furthermore，three kinds of visualization techniques’applications and existing problems in the evaluation of oil displacement agent were summarized. Visual micro displacement model and CT were suitable for the study of oil displacement agent flooding mechanism. The former method focused on the micro analysis，and the latter method focused on the macro analysis. CT and MRI were applicable for the evaluation of oil displacement performance. The former focused on the saturation distribution of residual oil along the way with light oil system，the latter focused on the distribution of remaining oil in different pore size with dilute oil system.