A modified cationic polyhydroxy-compound gel ling fluid as water shutoff is developed.This type of gel has better selectivity.Its field tests are descri bed and the results are satisfactory.

• 介绍了一种利用阳离子化改性多羟基化合物进行堵水调剖的方法，具有一定的选择性，在油田应用取得了良好效果。