This experiment aims to make a transparent glass areal micro-model on glass sheet, according to the complex pore structure of conglomerate reservoir rocks, and make a water-flooding test after wetting treatment for these conglomerate reservoir rocks to different levels, on the basis of which analyses will be made of the oil-water interface state in oil layers, the distribution regularity of the remaining oil, as well as the law of water flooding . The experiment demonstrates that：First, under the balancing conditions between oil and water distribution, the oil-water interface in micro-pores bumps in opposite directions in the oil wet and water wet models; second, remaining oil tends to be easily formed in such four typical pore structures as fine passes, vertical- flowing passes, big passes of the inner wall and blind holes in the micro-pore structures; third, the oil displacement efficiency of lipophilic oil layers is far lower than that of hydrophilic layers.