The Laser-induced Air Shock from Energetic Materials （LASEM）， a laser-induced air shock performance test method based on milligram-scale energetic materials on microsecond time scales， was combined with a pulsed laser system and high-speed ripple shadowing. The effects of different particle sizes and different stacking densities on the characteristic velocities of shock waves from five energetic materials （CL-20， HMX， RDX， FOX-7， LLM105） were investigated. The results show that when the particle size is less than 75 μm， the measurement results deviation is large. When the particle size is in the range of 75-500 μm， the measurement results are less volatile and consistent with the order of the burst pressure value， which can be used as reference data to assess the actual burst performance. When the bulk density is less than 0.7 g·cm^-3， the measurement results fluctuate in a wide range. When the bulk density is in the range of 0.7-1.35 g·cm^-3， the measurement results are more stable and consistent with the order of the burst pressure value， and thus the measurement value is more valuable.