Abstract: The microscopic change of rock attributes in four water-flooding sandstone reservoirs with typical sedimentary facies of Huabei Oilfield was investigated.The quantitative evolutionary patterns of the component,content and the combination features of clay minerals in rock of reservoir were simulated in laboratory using core samples.The effects of these evolutionary patterns on oil recovery of reservoir and the variations of pore configuration,sensitivity,wettability and percolation mechanism of rock in the reservoir were analyzed.The result shows that the oil-displacement efficiency of water-flooding reservoir was enhanced by serious evolvement of parameters in the process of water drive,especially by the improvement of rock wettabiltity.