Abstract: Based on the supervisions of remaining oil in well bore,the perforated parts of elastic reser-voirs with bottom water are water-flooded in 3 different extents:a) only the bottom;b) the whole;c)some parts.According to the analyses of water-flood types and reservoir characteristics,the productionof remaining oil at the top of perforated part in elastic reservoir with bottom water has achieved success.Taking into consideration of the influences of reservoir physical properties and production mea-surements,raising the perforation position is an important way to improve yielding rate when remainingoil is rich at the top of perforated part.