Abstract:  To explore the static blasting effect of the blasting parameters on vertical slope rocks，the static expansion pressure generated by static cracking agents are tested by using electrometric methods，and the static blasting test consider? ing resistance line，borehole spacing，horizontal pressure and borehole layout mode are designed. Test results show that，the expansion pressure generated by the static cracking agents increases exponentially with time under the radial constraint condition；Under the horizontal constraint condition，the greater the horizontal constraint，the greater the expansion pressure required for rock mass cracking；The residual horizontal tectonic stress of rock mass in the vertical stratum is the key parameter of the static blasting design；The crack connecting time increases nonlinearly with the borehole spacing and it is recommended that the design spacing for static blasting should be 2~2.5 times the diameter of the borehole. It is concluded that the blasting effect of triangular mode is obviously better than that of rectangular mode，and the static blasting process of excavating rock mass in slope with vertical stratum can be divided into four stages: micro-cracks developing in rock mass，crack propagation at the borehole edge，crack growth densely and rock mass fragmentation.

Key words: Blasting engineering, Static blasting parameter, Model test, Slope with vertical stratum