Abstract: Large-diameter deep hole in the VCR method of Anqing Copper Mine adopts the detonating cord blasting.In blasting process，some rich water holes are often met with.Even if the water in hole is handled by high-pressure wind before charging，water will be appeared soon.Therefore，the water hole blasting technology is needed.With the help of ANSYS finite element numerical simulation software，the detonating cord is blasted in air and water through numerical simulation.The calculation results indicate: the shock wave overpressure values produced in the water after explosion of detonating cord is greater than that in the air.After repeated reflection and overlay in the hole after firing，the maximum overpressure of the shock wave and the action time are all increased，resulting in a better blasting effect.

Key words: Rich water hole, Detonating cord, Blast wave