Abstract: By the prestressed and pulled diaphragm wall technology,an open pit slope in the water-containing stratum of gravel and pebbles was reinforced,and how to control the blasting to ensure the stability of slope is worthy of further study.In this paper,taking Shenglongxia open-pit mine as the background,the maxium one-stage charge and effect of blasting on the stability of reinforced slope are studied.The monitoring results show that the effect of blasting on the stability of slope is very little in a reasonable amount of maximum single fire dynamite.