Abstract: In conventional perforations, drilling path often deviates from reservoirs, and drilling depth is not enough to penetrate interlayers. In view of the difficulties of remaining oil tapping, a new perforating technique with gunpowder was innovated. To seal water, mechanical water plugging experiments were made under perforating hole environments. The technique was applied in one well with the fine interpretation of interlayers and the optimization of gunpowder. The interlayers were perforated through and the remaining oils were exploited, providing a new idea for tertiary oil recovery in the Tahe Oilfield.