Through adopting the parallel cut and inverse initiation, and selecting correct delay-interval, an average blasting efficiency of 90% had been achieved.

To investigate the parameters of parallel cut blast without empty holes, an advanced numerical method is used to study the explosion effect of charge in hole perpendicular to a free surface.

The undermine method of well drilling technology once of blasting is put forward as well as the calculation of blasting parameters and the demand of implementation for hole.