In order to effectively control the soft rock tunnel blasting vibration and accurate prediction of vibration intensity, according to the actual conditions of the site, the high precision digital detonator and the principle of waveform superposition interference are used to carry out accurate delay blasting experiment.The linear analysis is used to calculate the k and α values in the soft rock to predict the vibration.Research results show that:The delay time of the electronic detonator is optimized through experiments to make the blasting seismic waves interfere with each other so as to reduce the intensity of vibration and achieve the effect of interference shock absorption. The vibration peak value of the single stage electronic detonator is reduced by 36.5% after the delay optimization(The delay time of the optimized electronic detonator is 55 ms, and the delay time of the ordinary electronic detonator is 25ms). Based on the measured vibration data and the objective geological environment, the Sadovsky vibration attenuation formula which is in line with the field geological conditions is analyzed by using Sadovsky formula and linear regression analysis theory（α= 1.806 6, k = 389.01), which provide a reliable tool for more accurate vibration prediction. There is a certain error between the predicted data and the actual data. Through analysis, it can be known that the error is caused by the elevation difference and special soft rock.