Abstract:The rationality of using particle vibration velocity to describe blast-induced seismic effect is testified by using the stress-strain relation of rock and soil,and characteristics of wave propagation. A lot of seismic wave diagrams and frequency spectrograms are obtained from a lot of blast-induced seism. The propagation law and parameters of seismic wave in different places are studied. The regulations of blasting safety in China are compared with criteria used abroad,and it is theoretically interpreted that the limit value of vibration velocity and vibration frequence should be related to each other and put into the building safety criteria. Some improved methods and optional criteria of vibration velocity of blast seism are proposed.