Abstract: In response to the practical problem of selecting the vibration delay time for a certain sand and gravel quarry, a small-diameter borehole single-hole blasting vibration test was designed.Based on the Matlab software,the waveform data of single-hole blasting were superimposed and analyzed to study the variation characteristics of blasting vibration intensity and fre quency under different delay times.Through the blasting test with precise control of industrial electronic detonators,the peak vi bration velocity and frequency characteristics under different delay times were verified and analyzed.The study results showed that:① The blasting vibration in the single-hole test with small-diameter boreholes has a main vibration period of 13 ms to 18 ms and 18 ms to 26 ms at the blast center distances of 35 m and 55 m respectively.The superimposition of single-hole vibration waves indicates that the optimal vibration reduction delay is not within the main vibration period range,but is within the range of T/3 to 2T/3 (T is the period);② Under different delay times and different hole numbers,there are always delay intervals that are conducive to vibration reduction.By considering the peak vibration velocity and main frequency factors,the optimal vi bration reduction delay time for the test mine was determined to be 7 ms to 10 ms;③ A field test was designed and carried out with the mine slope as the protected object.Through multi-angle analysis such as peak vibration velocity,main frequency,and wavelet energy,40 ms was determined to have better vibration reduction characteristics.The study results have certain reference significance for seeking an economically reasonable and less harmful effect multi-hole vibration reduction blasting method from the perspective of protecting the protected object′s safety.