Abstract: The shallow hole spring blasting in the bottom step poses great threat to slope stability for the open pit mine's motioned slope and altituded multi-step performance. A parameter optimization research is done in the pre-splitting blasting in the finished slope in the crevasse growth. Continuous blasting experiments of a half year led to opeimized blasting parameters and leveled slope appropriate to the open pit mine. This research provides technical guidance to the slop treatment.