Abstract：Based on the domestic and foreign research achievements about the safety threshold of blasting vibration velocity，the dynamic responds of high rock slope of Xiaowan Hydropower Station under blasting vibration，are carried out；then due to the statistical relation between the peak value of tensile stress and peak particle velocity at the slope step，and according to the rule of limit tensile stress，the reasonable monitoring position and the safety threshold of rock slope during its excavation were made certain. The results of the detailed research indicate that the reasonable monitoring position for blasting vibration control is at the inside of the slope step；and the peak particle velocity safety threshold is 10 cm/s for rock slope excavation.
