The variation of water-cut and cumulative water-oil ratio with the per-centage of recoverable reserves exploited are studied, according to the result of recovery factors of water-flooded sandstone reservoirs exploited in our country by a specified procedure of estimation. 根据我国水驱砂岩油田采收率的标定结果,研究了我国水驱砂岩油田含水率与累积水油比随可采储量采出程度的变化关系。