Abstract: Through experiments of oil being flooded by water on conventional core models, we can only obtain parameters of the liquids at the moment prior to or after their passing through the related models. Nevertheless, we cannot demonstrate the moving process of the liquids inside the core models. By the CT scan technology, however, the overall locomotion process of various liquids passing through core models can be observed clearly, thus the distribution between oil and water in a wide variety of cores can also be directly investigated. The CT scan technology, accordingly, will be necessarily applied as a novel visualized tool for the study on distribution and characteristics of the moving process of water and oil inside the stratum.