Mountain rocks were encountered in the excavation of a construction project in urban scenic spot, rock slope blasting was to be carried out in this case. Pre-splitting blasting technology was used to reduce the blasting vibration damage and protect the integrity of the excavation profile. A pre-splitting blasting scheme was proposed based on the suitable design and the construction was carried out carefully in accordance with the scheme; meanwhile, the blasting vibration velocity of surrounding buildings was monitored. The results show that the vibration velocity of each monitoring point was much less than safety permission ranges with good macro blasting effect, which provides favorable excavation conditions for later blasting. This pre-splitting blasting technology has certain reference for the similar projects.