One wedge gate valve of venting steel pipe of a reservoir diversion tunnel in Hubei Provence failed to work properly, which caused a great safety threat to the operation of the reservoir.Therefore, effective measures should be taken to empty the reservoir in order to complete the rush repair of gate valves before the flood.According to the engineering characteristics and emergency needs, shaped charge blasting technique was selected to cut the vent steel pipe.and annular cutting and local rectangular cutting were designed and compared.According to the material and shape of shaped charge cutter, ANSYS/LS-DYNA and field tests were used to simulate and analyze the shaped charge cutting effect, where the fluidic velocity after penetrating the steel plate was taken as the evaluation index.Then the optimal blasting height of the cutter(top width=6 mm, bottom width=30 mm, height=25 mm, and liner angle=90°) was determined to be 13~17 mm.The practice showed that the steel pipe with a thickness of 14~16 mm can be cut successfully using the shaped charge cutter with a linear charge density of 380 g/m.Besides, the detonation mode, installation and blasting cutting effect of shaped charge cutter in practical engineering were introduced in detail, which provides a successful example for the similar engineering.